Class 12 Physics Ch-1 Electric Charges and Fields MCQs Exam 2027

Topic 1: Electric Charges and Fields

1. The force acting on a charged particle in an electric field is: [BSEB 2026]

(A) $qE$

(B) $q/E$

(C) $E/q$

(D) $\sqrt{qE}$

2. If the distance between two charges is halved and one charge is also halved, the force between them becomes: [BSEB 2026]

(A) Half

(B) Double

(C) Triple

(D) None of these

3. Which of the following quantities has the unit Volt/meter? [BSEB 2026]

(A) Electric Flux

(B) Electric Potential

(C) Electric Capacitance

(D) Electric Field

4. The dielectric constant of any substance is always greater than: [BSEB 2026]

(A) 0

(B) 0.5

(C) 1

(D) 2

5. The S.I. unit of electric flux is: [BSEB 2026]

(A) Ohm-meter

(B) Ampere-meter

(C) Volt-meter

(D) $\text{Volt}\cdot\text{meter}^{-1}$

6. Permittivity of free space ($\epsilon_0$) is: [BSEB 2026]

(A) $9 \times 10^9$ mF$^{-1}$

(B) $1.6 \times 10^{-19}$ C

(C) $8.85 \times 10^{-12}$ Fm$^{-1}$

(D) None of these

7. The S.I. unit of permittivity is: [BSEB 2026]

(A) N$^{-1}$M$^{-2}$C$^2$

(B) NM$^2$C$^{-2}$

(C) N$^{-1}$M$^2$C$^2$

(D) None of these

8. If a charge on a sphere is $10 \mu\text{C}$, the electric flux on its surface is: [BSEB 2026]

(A) $36\pi \times 10^4 \text{ Nm}^2/\text{C}$

(B) $36\pi \times 10^{-4} \text{ Nm}^2/\text{C}$

(C) $36\pi \times 10^6 \text{ Nm}^2/\text{C}$

(D) $36\pi \times 10^{-6} \text{ Nm}^2/\text{C}$

9. The number of electrons to be removed from an uncharged body to give it a charge of 1 Coulomb is: [BSEB 2026]

(A) $6.25 \times 10^{18}$

(B) $6.25 \times 10^8$

(C) $6.23 \times 10^{23}$

(D) None of these

10. Gauss’s law states that the total electric flux through a closed surface is: [BSEB 2026]

(A) Proportional to the enclosed charge

(B) Inversely proportional to the enclosed charge

(C) Zero

(D) Proportional to the square of the enclosed charge

11. The ratio of electric and gravitational forces between an electron and a proton is of the order of: [BSEB 2026]

(A) $10^{42}$

(B) $10^{39}$

(C) $10^{36}$

(D) 1

12. The surface charge density of a charged conductor is $\sigma$. The electric field near it is: [BSEB 2026]

(A) $\frac{\sigma}{2 \varepsilon_0}$

(B) $\frac{\sigma}{\varepsilon_0}$

(C) $\frac{2\sigma}{\varepsilon_0}$

(D) $\frac{\sigma}{3 \varepsilon_0}$

13. Dimension of charge is: [BSEB 2026]

(A) AT

(B) AT$^{-1}$

(C) A$^{-1}$T (D) AT$^2$

14. Dielectric constant of metal is: [BSEB 2026]

(A) 0

(B) 1

(C) 10

(D) Infinity ($\infty$)

15. Dimension of electric intensity is: [BSEB 2026]

(A) $[\text{MLT}^{-2}\text{I}^{-1}]$

(B) $[\text{MLT}^{-3}\text{I}^{-1}]$

(C) $[\text{ML}^2\text{T}^{-3}\text{I}^{-2}]$

(D) $[\text{ML}^2\text{T}^2\text{I}^2]$

16. Number of electrons present in 8 Coulomb of negative charge is: [BSEB 2026]

(A) $5 \times 10^{19}$

(B) $2.5 \times 10^{19}$

(C) $12.8 \times 10^{19}$

(D) $1.6 \times 10^{19}$

17. Coulomb force is: [BSEB 2026]

(A) Central force

(B) Electric force

(C) Both (A) and (B)

(D) None of these

18. Surface density of charge is: [BSEB 2026]

(A) $\sigma = \frac{Q}{A}$

(B) $\sigma = \frac{Q}{l}$

(C) $\sigma = \frac{Q}{V}$

(D) $\sigma = QA$

19. When a soap bubble is charged, its radius: [BSEB 2026]

(A) Increases

(B) Decreases

(C) Remains unchanged

(D) Becomes zero

20. Unit of linear charge density is: [BSEB 2026]

(A) Coulomb/meter

(B) Coulomb $\times$ meter

(C) meter/Coulomb

(D) None of these

21. Electric flux from a closed surface is proportional to: [BSEB 2026]

(A) $1/\epsilon_0$ times the charge

(B) $\epsilon_0$ times the charge

(C) $4\pi\epsilon_0$ times the charge

(D) None of these

22. If the charge is doubled and the distance is halved, the force $F$ becomes: [BSEB 2026]

(A) $4F$

(B) $8F$

(C) $16F$

(D) $64F$

23. Electric field inside a charged hollow spherical conductor is: [BSEB 2026]

(A) $E_0 \sigma$

(B) $\sigma / \varepsilon_0$

(C) Zero

(D) $E_0/2$

24. Dimensional formula of electric flux is: [BSEB 2026]

(A) $[\text{ML}^3\text{T}^{-3}\text{A}^{-1}]$

(B) $[\text{ML}^{-3}\text{T}^{-3}\text{A}]$

(C) $[\text{ML}^2\text{T}^{-3}\text{A}^{-1}]$

(D) None of these

25. Electric field at the surface of a charged conductor is: [BSEB 2026]

(A) Parallel to surface

(B) Perpendicular to surface

(C) At $45^\circ$

(D) Zero

26. 1 stat-Coulomb = ……. Coulomb: [BSEB 2026]

(A) $3 \times 10^9$

(B) $3 \times 10^{-9}$

(C) $\frac{1}{3} \times 10^9$

(D) $\frac{1}{3} \times 10^{-9}$

27. Vector form of Coulomb’s law is: [BSEB 2026]

(A) $\vec{F} = \frac{1}{4\pi\varepsilon_0} \frac{q_1q_2}{r^3} \vec{r}$

(B) $\vec{F} = \frac{1}{4\pi\varepsilon_0} \frac{q_1q_2}{r^2} \hat{r}$

(C) Both (A) and (B)

(D) None of these

28. Electric field at the centroid of a triangle with charge $q$ at each vertex is: [BSEB 2026]

(A) 0

(B) $\frac{3Kq}{r^2}$

(C) $\frac{Kq}{r^2}$

(D) None of these

29. Static electric field is: [BSEB 2026]

(A) Conservative

(B) Non-conservative

(C) Both

(D) None

30. Relative permittivity ($\epsilon_r$) is equal to: [BSEB 2026]

(A) $\varepsilon / \varepsilon_0$

(B) $\varepsilon \times \varepsilon_0$

(C) $\varepsilon + \varepsilon_0$

(D) $\varepsilon – \varepsilon_0$

31. Path of an electron entering an electric field at an angle other than $0^\circ$ or $180^\circ$: [BSEB 2026]

(A) Straight line

(B) Circle

(C) Parabola

(D) Ellipse

32. Net flux from a closed surface containing charges $-q, +2q, -q$ is: [BSEB 2026]

(A) 0

(B) $q/\epsilon_0$

(C) $-q/\epsilon_0$

(D) None

33. Electric intensity at a point is: [BSEB 2026]

(A) $E = Fq$

(B) $E = F/q$

(C) $E = q/F$

(D) None

34. When a body is charged, its mass: [BSEB 2026]

(A) Increases

(B) Decreases

(C) Remains constant

(D) May increase or decrease

35. Quantum of electric charge in e.s.u. is: [BSEB 2026]

(A) $4.78 \times 10^{-10}$

(B) $1.6 \times 10^{-19}$

(C) $2.99 \times 10^9$

(D) None

36. 1 Coulomb = …… e.s.u. [BSEB 2026]

(A) $3 \times 10^9$

(B) $9 \times 10^9$

(C) $8.85 \times 10^{-12}$

(D) None

37. Total flux coming out from unit positive charge in air is: [BSEB 2026]

(A) $\epsilon_0$

(B) $(\epsilon_0)^{-1}$

(C) $4\pi \epsilon_0$

(D) None

38. Coulomb’s law is valid for: [BSEB 2026]

(A) Point charges only

(B) Extended charges

(C) Both

(D) Neutral particles

39. Unit of electric intensity is: [BSEB 2026]

(A) N/C

(B) V/m

(C) Both (A) and (B)

(D) None

40. Surface charge density $\sigma$ is equal to: [BSEB 2026]

(A) Total charge / Total Area

(B) Total charge / Total Volume

(C) Charge $\times$ Area

(D) None

41. The value of $\frac{1}{4\pi\varepsilon_0}$ is: [BSEB 2026]

(A) $9 \times 10^9 \text{ Nm}^2\text{C}^{-2}$

(B) $9 \times 10^{-9} \text{ Nm}^2\text{C}^{-2}$

(C) $8.85 \times 10^{-12} \text{ Nm}^2\text{C}^{-2}$

(D) None

42. Minimum possible charge on a body is: [BSEB 2026]

(A) $1.6 \times 10^{-19}$ C

(B) 1 C

(C) $4.8 \times 10^{-19}$ C

(D) None

43. Which value of $n$ is not possible in $Q = ne$? [BSEB 2026]

(A) 4

(B) 8

(C) 4.2

(D) 100

44. If two equal charges $Q$ have a charge $q$ placed at their midpoint for equilibrium, $q$ is: [BSEB 2026]

(A) $Q/4$

(B) $-Q/4$

(C) $Q/2$

(D) $-Q/2$

45. Dielectric strength of air is: [BSEB 2026]

(A) $3 \times 10^6 \text{ V/m}$

(B) $10^6 \text{ V/m}$

(C) $3 \times 10^4 \text{ V/m}$

(D) None

46. A stationary charge produces: [BSEB 2026]

(A) Only electric field

(B) Only magnetic field

(C) Both

(D) None

47. If a dielectric is placed between two charges, the force: [BSEB 2026]

(A) Increases

(B) Decreases

(C) Remains same

(D) Becomes zero

48. Electric field at a distance $r$ from a point charge follows: [BSEB 2026]

(A) $E \propto r$

(B) $E \propto 1/r^2$

(C) $E \propto 1/r$

(D) None

49. S.I. unit of electric flux is: [BSEB 2026]

(A) Volt-meter

(B) Ohm-meter

(C) Tesla

(D) Weber

50. The value of charge on an electron is: [BSEB 2026]

(A) $1.6 \times 10^{-19}$ C

(B) $-1.6 \times 10^{-19}$ C

(C) $1.6 \times 10^{-18}$ C

(D) None

Topic 2: Electric Potential and Capacitance

51. Electric potential dimension is: [BSEB 2026]

(A) $[\text{ML}^2\text{T}^{-3}\text{A}^{-1}]$

(B) $[\text{ML}^2\text{T}^{-2}\text{A}^{-1}]$

(C) $[\text{MLT}^{-3}\text{A}^{-1}]$

(D) None

52. Work done in moving a charge $q$ through potential $V$ is: [BSEB 2026]

(A) $W = qV$

(B) $W = q/V$

(C) $W = V/q$

(D) None

53. 1 Farad (F) is equal to: [BSEB 2026]

(A) $1 \text{ CV}^{-1}$

(B) $1 \text{ CV}$

(C) $1 \text{ C/V}^2$

(D) None

54. Energy stored in a capacitor is: [BSEB 2026]

(A) $U = \frac{1}{2}CV^2$

(B) $U = CV^2$

(C) $U = \frac{1}{2}C^2V$

(D) None

55. If area of plates of a parallel plate capacitor is doubled, capacitance: [BSEB 2026]

(A) Doubles

(B) Halves

(C) Remains same

(D) None

56. Dielectric constant of water is: [BSEB 2026]

(A) 80

(B) 1

(C) 60

(D) None

57. Equivalent capacitance of 3 capacitors of $C$ each in series: [BSEB 2026]

(A) $3C$

(B) $C/3$

(C) $3/C$

(D) None

58. Equivalent capacitance of 2 capacitors of $2\mu\text{F}$ and $4\mu\text{F}$ in parallel: [BSEB 2026]

(A) $6 \mu\text{F}$

(B) $2 \mu\text{F}$

(C) $8 \mu\text{F}$

(D) None

59. Van de Graaff generator is used to produce: [BSEB 2026]

(A) High voltage

(B) High current

(C) Low voltage

(D) None

60. Relationship between $E$ and $V$ is: [BSEB 2026]

(A) $E = -dV/dr$

(B) $E = dV/dr$

(C) $V = -dE/dr$

(D) None

61. Potential inside a hollow charged sphere is: [BSEB 2026]

(A) Zero

(B) Constant

(C) $q/r^2$

(D) None

62. If distance between plates of a capacitor increases, its capacitance: [BSEB 2026]

(A) Decreases

(B) Increases

(C) No change

(D) None

63. S.I. unit of capacitance is: [BSEB 2026]

(A) Farad

(B) Coulomb

(C) Volt

(D) Ohm

64. Capacity of an isolated spherical conductor of radius $R$ is: [BSEB 2026]

(A) $4\pi\epsilon_0 R$

(B) $R/4\pi\epsilon_0$

(C) $4\pi\epsilon_0 R^2$

(D) None

65. Energy density of a parallel plate capacitor is: [BSEB 2026]

(A) $\frac{1}{2} \epsilon_0 E^2$

(B) $\frac{1}{2} \epsilon_0^2 E$

(C) $\epsilon_0 E$

(D) None

66. When a dielectric is introduced, capacitance: [BSEB 2026]

(A) Increases

(B) Decreases

(C) Zero

(D) Constant

67. Capacitance of a capacitor does not depend on: [BSEB 2026]

(A) Charge on plates

(B) Area of plates

(C) Distance between plates

(D) Medium

68. 1 electron-volt (eV) is a unit of: [BSEB 2026]

(A) Energy

(B) Potential

(C) Charge

(D) Force

69. 1 eV is equal to: [BSEB 2026]

(A) $1.6 \times 10^{-19}$ J

(B) $1.6 \times 10^{-31}$ J

(C) $9.1 \times 10^{-31}$ J

(D) None

70. Capacitors are used to store: [BSEB 2026]

(A) Electric charge/energy

(B) Current

(C) Voltage

(D) Resistance

71. Three capacitors of $6\mu\text{F}$ each are in series. Resultant is: [BSEB 2026]

(A) $2\mu\text{F}$

(B) $18\mu\text{F}$

(C) $12\mu\text{F}$

(D) None

72. Potential at a point due to a point charge $q$ is: [BSEB 2026]

(A) $Kq/r$

(B) $Kq/r^2$

(C) $Kq^2/r$

(D) None

73. Unit of potential gradient is: [BSEB 2026]

(A) V/m

(B) Vm

(C) V/m$^2$

(D) None

74. Potential energy of two charges $q_1, q_2$ is: [BSEB 2026]

(A) $Kq_1q_2/r$

(B) $Kq_1q_2/r^2$

(C) $q_1q_2/r$

(D) None

75. Capacitor blocks: [BSEB 2026]

(A) D.C.

(B) A.C.

(C) Both

(D) None

76. Dielectric constant of a vacuum is: [BSEB 2026]

(A) 1

(B) 0

(C) Infinity

(D) None

77. Work done in rotating a dipole in electric field is: [BSEB 2026]

(A) $pE(1 – \cos\theta)$

(B) $pE \sin\theta$

(C) $pE \cos\theta$

(D) None

78. Electric potential at an equatorial point of a dipole is: [BSEB 2026]

(A) Zero

(B) $Kp/r^2$

(C) $Kp/r$

(D) None

79. If $n$ capacitors in parallel, total $C$ is: [BSEB 2026]

(A) $nC$

(B) $C/n$

(C) $n^2C$

(D) None

80. Electric potential is a: [BSEB 2026]

(A) Scalar quantity

(B) Vector quantity

(C) Tensor

(D) None

Topic 3: Electric Dipole

81. Unit of dipole moment is: [BSEB 2026]

(A) Coulomb-meter

(B) Debye

(C) Both (A) and (B)

(D) None

82. Torque on a dipole $\vec{\tau}$ is: [BSEB 2026]

(A) $\vec{p} \times \vec{E}$

(B) $\vec{p} \cdot \vec{E}$

(C) $pE \cos\theta$

(D) None

83. Electric field on the axis of a dipole varies as: [BSEB 2026]

(A) $1/r^3$

(B) $1/r^2$

(C) $1/r$

(D) None

84. 1 Debye is equal to: [BSEB 2026]

(A) $\frac{1}{3} \times 10^{-29}$ C-m

(B) $3 \times 10^{-29}$ C-m

(C) $10^{-30}$ C-m

(D) None

85. Direction of dipole moment is: [BSEB 2026]

(A) Negative to positive charge

(B) Positive to negative charge

(C) North to South

(D) None

86. A dipole in a uniform electric field experiences: [BSEB 2026]

(A) Only torque

(B) Only net force

(C) Both

(D) Neither

87. Maximum torque on a dipole occurs at: [BSEB 2026]

(A) $90^\circ$

(B) $0^\circ$

(C) $180^\circ$

(D) None

88. Potential energy of a dipole in electric field is: [BSEB 2026]

(A) $-\vec{p} \cdot \vec{E}$

(B) $\vec{p} \times \vec{E}$

(C) $pE \sin\theta$

(D) None

89. Force between two dipoles varies as: [BSEB 2026]

(A) $1/r^4$

(B) $1/r^3$

(C) $1/r^2$

(D) None

90. Dipole moment is a: [BSEB 2026]

(A) Vector quantity

(B) Scalar quantity

(C) Constant

(D) None

Topic 4: Conductors and Dielectrics

91. Inside a conductor, electric field is: [BSEB 2026]

(A) Zero

(B) $E$

(C) Infinity

(D) None

92. Polar dielectrics have permanent: [BSEB 2026]

(A) Dipole moment

(B) Charge

(C) Current

(D) None

93. Example of a non-polar dielectric: [BSEB 2026]

(A) $H_2$

(B) $H_2O$

(C) $HCl$

(D) $NH_3$

94. Capacitance of Earth ($R = 6400$ km) is: [BSEB 2026]

(A) $711 \mu\text{F}$

(B) $1 \text{ F}$

(C) $9 \times 10^9 \text{ F}$

(D) None

95. Dielectric strength of a material depends on: [BSEB 2026]

(A) Thickness

(B) Temperature

(C) Humidity

(D) All of these

96. Potential gradient is equal to: [BSEB 2026]

(A) $-E$

(B) $E$

(C) $V/r^2$

(D) None

97. Sharing of charges between two conductors results in loss of: [BSEB 2026]

(A) Energy

(B) Charge

(C) Potential

(D) None

98. The ratio of $C_{parallel} / C_{series}$ for $n$ capacitors is: [BSEB 2026]

(A) $n^2$

(B) $n$

(C) $1/n^2$

(D) None

99. If a glass slab is inserted in a capacitor, energy stored: [BSEB 2026]

(A) Increases

(B) Decreases

(C) Zero

(D) None

100. SI unit of polarization density is: [BSEB 2026]

(A) $\text{C/m}^2$

(B) $\text{C/m}$

(C) $\text{Cm}$

(D) None

Topic 5: Gauss’s Law Applications

101. Flux through a cube of side $a$ with charge $q$ at center is: [BSEB 2026]

(A) $q/\epsilon_0$

(B) $q/6\epsilon_0$

(C) $q/8\epsilon_0$

(D) None

102. Electric field due to infinite line charge is: [BSEB 2026]

(A) $\lambda/2\pi\epsilon_0 r$

(B) $\lambda/4\pi\epsilon_0 r^2$

(C) Zero

(D) None

103. Electric field due to infinite sheet of charge is: [BSEB 2026]

(A) $\sigma/2\epsilon_0$

(B) $\sigma/\epsilon_0$

(C) $2\sigma/\epsilon_0$

(D) None

104. Flux is a: [BSEB 2026]

(A) Scalar

(B) Vector

(C) Tensor

(D) None

105. Gauss law is used to find: [BSEB 2026]

(A) Electric field

(B) Potential

(C) Force

(D) None

106. Charge is located at a vertex of a cube, flux through cube is: [BSEB 2026]

(A) $q/8\epsilon_0$

(B) $q/\epsilon_0$

(C) $q/4\epsilon_0$

(D) None

107. Total flux through a closed surface depends on: [BSEB 2026]

(A) Enclosed charge only

(B) Shape of surface

(C) Size of surface

(D) None

108. Unit of $\epsilon_0$ is: [BSEB 2026]

(A) $\text{C}^2 \text{N}^{-1} \text{m}^{-2}$

(B) $\text{F/m}$

(C) Both (A) and (B)

(D) None

109. Electric field inside a non-conducting solid sphere: [BSEB 2026]

(A) $E \propto r$

(B) $E = 0$

(C) $E \propto 1/r^2$

(D) None

110. Surface integral of $E$ over closed surface is: [BSEB 2026]

(A) $q_{net}/\epsilon_0$

(B) Zero

(C) $V$

(D) None

Topic 6: Miscellaneous Important Questions

111. If charge $Q$ is divided into two parts $q$ and $Q-q$, force is max when $q/Q$ is: [BSEB 2026]

(A) 0.5

(B) 1

(C) 0.25

(D) None

112. Charge is: [BSEB 2026]

(A) Quantized

(B) Conserved

(C) Additive

(D) All of these

113. 1 Coulomb is how many electrons? [BSEB 2026]

(A) $6.25 \times 10^{18}$

(B) $1.6 \times 10^{-19}$

(C) $6 \times 10^{23}$

(D) None

114. If a soap bubble is charged, its internal pressure: [BSEB 2026]

(A) Decreases

(B) Increases

(C) Constant

(D) None

115. Electric field lines: [BSEB 2026]

(A) Do not intersect

(B) Form closed loops

(C) Both

(D) None

116. Ratio of $E$ for two spheres with equal $\sigma$ is: [BSEB 2026]

(A) 1:1

(B) $r_1:r_2$

(C) $r_2:r_1$

(D) None

117. Potential at the center of a square with charge $q$ at each corner: [BSEB 2026]

(A) $4Kq/r$

(B) Zero

(C) $Kq/r$

(D) None

118. Which is not a unit of energy? [BSEB 2026]

(A) Watt

(B) Joule

(C) eV

(D) kWh

119. Capacitance of a capacitor with vacuum is 10. With dielectric $K=5$, it is: [BSEB 2026]

(A) 50

(B) 2

(C) 5

(D) None

120. Net charge on a capacitor is: [BSEB 2026]

(A) Zero

(B) $Q$

(C) $2Q$

(D) None

121. Dielectric constant of air is: [BSEB 2026]

(A) 1.0006

(B) 1

(C) 0

(D) Infinity

122. Coulomb law follows: [BSEB 2026]

(A) Inverse square law

(B) Direct square law

(C) Newton’s 3rd Law

(D) Both (A) and (C)

123. Work done by electric field on a charge in a closed path is: [BSEB 2026]

(A) Zero

(B) $qV$

(C) $E \cdot d$

(D) None

124. At a very large distance, a dipole looks like a: [BSEB 2026]

(A) Point charge

(B) Sheet

(C) Nothing

(D) None

125. Force on a dipole in non-uniform field: [BSEB 2026]

(A) Non-zero

(B) Zero

(C) Constant

(D) None

126. If $V = 100$ V and $C = 1 \mu\text{F}$, charge is: [BSEB 2026]

(A) $100 \mu\text{C}$

(B) $1 \text{ C}$

(C) $100 \text{ C}$

(D) None

127. Which can be used as a dielectric? [BSEB 2026]

(A) Glass

(B) Mica

(C) Paper

(D) All of these

128. Electric field is always _____ to equipotential surface: [BSEB 2026]

(A) Normal

(B) Tangential

(C) Parallel

(D) None

129. If $r$ increases, potential due to point charge: [BSEB 2026]

(A) Decreases

(B) Increases

(C) Constant

(D) None

130. Charge on $1\mu\text{F}$ capacitor with 1V is: [BSEB 2026]

(A) $1\mu\text{C}$

(B) 1C

(C) Zero

(D) None

131. When a soap bubble is charged, its size: [BSEB 2026]

(A) Increases

(B) Decreases

(C) Constant

(D) None

132. Ratio of $E$ for $r_1, r_2$ spheres with equal $\sigma$: [BSEB 2026]

(A) 1:1

(B) $r_1/r_2$

(C) $r_2/r_1$

(D) None

133. Coulomb law is for: [BSEB 2026]

(A) Point charges

(B) Neutral particles

(C) Both

(D) None

134. Unit of flux: [BSEB 2026]

(A) V-m

(B) N/C

(C) Tesla

(D) None

135. Flux from unit positive charge: [BSEB 2026]

(A) $\epsilon_0^{-1}$

(B) $\epsilon_0$

(C) 1

(D) None

136. If $E=0$, $V$ with distance $r$ is: [BSEB 2026]

(A) Constant

(B) $1/r$

(C) $1/r^2$

(D) None

137. Field inside dielectric in external field: [BSEB 2026]

(A) Decreases

(B) Increases

(C) Constant

(D) None

138. Charge on $1\mu\text{F}$ at 1V: [BSEB 2026]

(A) $1\mu\text{C}$

(B) 1C

(C) Zero

(D) None

139. Torque is max when angle is: [BSEB 2026]

(A) $90^\circ$

(B) $0^\circ$

(C) $180^\circ$

(D) None

140. Plate area halved, $C$ becomes: [BSEB 2026]

(A) Half

(B) Double

(C) Same

(D) None

141. Alpha particle moved toward alpha particle, P.E.: [BSEB 2026]

(A) Increases

(B) Decreases

(C) Constant

(D) None

142. Dielectric of water: [BSEB 2026]

(A) 80

(B) 1

(C) 0

(D) None

143. Capacitor is insulator for: [BSEB 2026]

(A) DC

(B) AC

(C) Both

(D) None

144. Potential at equatorial point of dipole: [BSEB 2026]

(A) Zero

(B) $Kp/r^2$

(C) $Kp/r$

(D) None

145. Ratio of $C_{tot}$ series to parallel for $n$ capacitors: [BSEB 2026]

(A) $1/n^2$

(B) $n^2$

(C) $n$

(D) None

146. Unit of capacitance is Farad, equal to: [BSEB 2026]

(A) C/V

(B) J/V

(C) N/C

(D) None

147. Glass rod inserted in capacitor, $C$: [BSEB 2026]

(A) Increases

(B) Decreases

(C) Same

(D) None

148. Two capacitors $2\mu\text{F}$ and $4\mu\text{F}$ in parallel, total $C$: [BSEB 2026]

(A) $6 \mu\text{F}$

(B) $8 \mu\text{F}$

(C) $2 \mu\text{F}$

(D) None

149. Relation $E$ and $V$: [BSEB 2026]

(A) $E = -dV/dr$

(B) $E = dV/dr$

(C) $V = -dE/dr$

(D) None

150. Field inside a hollow charged conductor: [BSEB 2026]

(A) Zero

(B) Constant

(C) $E$

(D) None