Q1: 1. What is the SI unit of charge?

• A) Volt
• B) Ampere
• C) Coulomb
• D) Ohm

Q2: 2. Which of the following particles carries a positive charge?

• A) Electron
• B) Proton
• C) Neutron
• D) Positron

Q3: 3. Two charges, +Q and -Q, are placed at a distance r apart. What is the electric field at the midpoint between the two charges?

• A) Zero
• B) 2kQ/r
• C) kQ/r^2
• D) kQ/r

Q4: 4. What is the force between two charges Q1 and Q2 separated by a distance r in a vacuum?

• A) Q1Q2/4πεr^2
• B) Q1Q2/2πεr^2
• C) Q1Q2/εr^2
• D) Q1Q2/3πεr^2

Q5: 5. What is the electric field due to a point charge Q at a distance r from the charge?

• A) Q/4πεr^2
• B) Q/2πεr^2
• C) Q/εr^2
• D) Q/3πεr^2

Q6: 6. Which of the following statements about electric field lines is true?

• A) Electric field lines always point towards negative charges.
• B) Electric field lines cannot intersect each other.
• C) Electric field lines are not affected by the presence of charges.
• D) Electric field lines originate from positive charges.

Q7: 7. When a glass rod is rubbed with silk, the glass rod becomes positively charged. What charge does the silk acquire?

• A) Positive
• B) Negative
• C) Neutral
• D) Variable

Q8: 8. The force between two charges is F when they are placed in a medium of dielectric constant K. What will be the force between them in a vacuum?

• A) F/K
• B) F√K
• C) FK
• D) F/K^2

Q9: 9. What happens to the magnitude of the electric field between two charges if the distance between them is doubled?

• A) Increases by a factor of 2
• B) Increases by a factor of 4
• C) Decreases by a factor of 2
• D) Decreases by a factor of 4

Q10: 10. What is the electric potential energy of a system of two charges when they are brought closer together?

• A) Increases
• B) Decreases
• C) Remains constant
• D) Becomes zero

Q11: 11. Which of the following materials is a good conductor of electricity?

• A) Wood
• B) Rubber
• C) Copper
• D) Plastic

Q12: 12. What is the direction of the electric field at a point where a positive test charge would experience a repulsive force?

• A) Towards the point charge
• B) Away from the point charge
• C) Parallel to the point charge
• D) Perpendicular to the point charge

Q13: 13. What is the electric field inside a hollow conducting sphere?

• A) Zero
• B) Non-zero
• C) Variable
• D) Infinite

Q14: 14. An electron experiences a force of magnitude F when placed in an electric field. What will be the force experienced by a proton placed in the same field?

• A) F
• B) -F
• C) 2F
• D) -2F

Q15: 15. What is the electric potential at a point in an electric field where the work done to bring a unit positive charge from infinity is 5 J?

• A) 5 V
• B) 1 V
• C) 10 V
• D) 2 V

Q16: 16. How does the electric field vary with distance from a point charge?

• A) Linearly
• B) Inversely proportional to the distance squared
• C) Directly proportional to the distance squared
• D) Inversely proportional to the distance

Q17: 17. Two charges, +Q and -2Q, are placed at a distance 2r apart. What is the electric potential at the point midway between the charges?

• A) 2kQ/r
• B) 3kQ/r
• C) kQ/r
• D) 0

Q18: 18. Which of the following statements is true about equipotential surfaces?

• A) Electric field lines are always perpendicular to equipotential surfaces.
• B) Work done in moving a charge on an equipotential surface is zero.
• C) Equipotential surfaces can intersect each other.
• D) Equipotential surfaces have varying potential along their surface.

Q19: 19. What is the relationship between electric field and potential in an electric field?

• A) Electric field is the negative gradient of potential.
• B) Potential is the negative gradient of electric field.
• C) Electric field is the integral of potential.
• D) Potential is the integral of electric field.

Q20: 20. When a charged particle moves in an electric field, what happens to its potential energy?

• A) Increases
• B) Decreases
• C) Remains constant
• D) Becomes zero

Q21: 21. What is the electric field intensity at a point where the potential is 10 V and the charge is 2 C?

• A) 20 N/C
• B) 5 N/C
• C) 2 N/C
• D) 10 N/C

Q22: 22. What is the force experienced by a charge of 3 μC in an electric field of intensity 4 N/C?

• A) 12 μN
• B) 7 μN
• C) 1 μN
• D) 0.75 μN

Q23: 23. What is the work done in moving a charge of 5 μC through a potential difference of 20 V?

• A) 100 J
• B) 25 J
• C) 4 J
• D) 1 J

Q24: 24. Which of the following statements is true about conductors in electrostatic equilibrium?

• A) The electric field inside a conductor is zero.
• B) The electric field inside a conductor is maximum.
• C) The charge on a conductor is only on its surface.
• D) The charge on a conductor is distributed uniformly throughout its volume.

Q25: 25. What is the electric potential energy of a system of three charges when they are arranged in an equilateral triangle?

• A) Zero
• B) Maximum
• C) Minimum
• D) Variable