Electric Charges and Fields

Bihar Board Class 12 · Physics · 53 past questions

1. Q1 2026 Set A

   Coulomb's law is valid for

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2. Q2 2026 Set A

   The surface charge densities on the surface of two conducting spheres of radii $r_1$ and $r_2$ are equal. The…

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3. Q3 2026 Set A

   When an electric dipole $\vec{p}$ is placed in a uniform electric field $\vec{E}$, then at what angle between…

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4. Q4 2026 Set A

   When a soap bubble is charged, then its size

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5. Q5 2025 Set D

   Two equal positive point charges of 1 $\mu C$ charge are kept at a distance of 1 metre in air. The electric…

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6. Q6 2025 Set D

   The electric field on the outer surface of a charged conductor is

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7. Q7 2025 Set D

   If a conductor is placed in an external electric field, the field inside the conductor will be

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8. Q8 2025 Set D

   Gauss's law states that the electric flux through a closed surface is

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9. Q9 2025 Set D

   The distance between two charges is made half and one of the charges is also halved. The force acting between…

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10. Q10 2025 Set D

    Inside a closed surface, $n$ electric dipoles are situated. The electric flux coming out from the closed…

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11. Q11 2025 Set D

    Which of the following has unit volt-metre$^{-1}$?

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12. Q12 2024 Set A

    Unit of linear charge density is

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13. Q13 2024 Set A

    The dimensional formula of intensity of electric field is

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14. Q14 2024 Set A

    Number of electrons present in 8 coulomb negative charge is

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15. Q15 2024 Set A

    Two equal and opposite charges of 5 coulomb are kept mutually at a distance of 5.0 cm. The electric dipole…

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16. Q16 2024 Set A

    On moving from the surface of a charged metallic sphere to the centre of the sphere, the electric field

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17. Q17 2024 Set A

    n electric dipoles are situated in a closed surface. Total electric flux coming out from closed surface will…

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18. Q18 2023 Set F

    Van de Graaff generator is an electrostatic machine which produces

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19. Q19 2023 Set F

    S.I. unit of permittivity is

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20. Q20 2023 Set F

    The total electric flux coming out from stationary unit positive charge in air is

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21. Q21 2023 Set F

    The force, acting on per unit charge is called

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22. Q22 2023 Set F

    Quantisation of charge indicates that

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23. Q23 2023 Set F

    Electric field lines provide information about

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24. Q24 2023 Set F

    The ratio of electric force and gravitational force acting between two charges is in the order of

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25. Q25 2023 Set F

    A charge 'q' placed at the centre on the line joining two charges 'Q' will be in equilibrium if 'q' will be…

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26. Q26 2023 Set F

    What is the angle between the electric dipole moment $\vec{P}$ and the electric field strength $\vec{E}$ when…

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27. Q27 2023 Set F

    Which of the following physical quantities is a vector?

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28. Q28 2023 Set F

    The law, governing the force acting between two electric charges known as

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29. Q29 2022 Set I

    Intensity of electric field at a point is

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30. Q30 2022 Set I

    Surface density of charge is

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31. Q31 2022 Set I

    The S.I. unit of electric intensity is

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32. Q32 2022 Set I

    The permittivity of free space is

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33. Q33 2022 Set I

    The vector form of Coulomb's law is

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34. Q34 2021 Set A

    The relative permittivity ($\epsilon_r$) of a medium is

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35. Q35 2021 Set A

    Surface density of charge is equal to

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36. Q36 2021 Set A

    The value of $\frac{1}{4\pi\epsilon_0}$ is

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37. Q37 2021 Set A

    Which of the following relations is correct ?

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38. Q38 2021 Set A

    S.I. unit of electric dipole moment is

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39. Q39 2021 Set A

    The value of $\epsilon_r$ in air is

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40. Q40 2021 Set A

    The value of force acting on a charged particle in electric field is

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41. Q41 2021 Set A

    Which of the following values of $n$ is not possible in relation $Q = ne$ ?

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42. Q42 2019

    Unit of surface charge density is

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43. Q43 2019

    Two point charges of $+10\mu c$ and $-10\mu c$ are placed at a distance 40cm in air. Potential energy of the…

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44. Q44 2019

    If +q charge is placed inside any spherical surface then total flux coming out from whole surface will be

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45. Q45 2019

    Define electric flux. Write its SI unit.

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46. Q46 2019

    Define flux of electric field on a surface.

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47. Q47 2018

    The electric field at a point near an infinite thin sheet of charged conductor is…

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48. Q48 2018

    When a body is charged, its mass

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49. Q49 2018

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50. Q50 2018

    The side of an equilateral triangle is 20cm. Two equal point chargers (+) 3nC are placed at its two corners.… (with a figure)

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51. Q51 2018

    Atmosphere is not electrically neutral. Explain why?

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52. Q52 2017

    The electrical intensity inside a charged hollow sphere is

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53. Q53 2017

    Draw lines of force of electric field due to a system of two equal point charges. (with a figure)

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