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Class 12 Physics: Charges and Fields
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MCQs on electric charges and its basic properties, conductors, insulators, induction charging, coulombs law, electric field, electric flux, electric field lines, electric dipole, continuous charge distribution, gauss law and its applications.

Class 12 Physics: Charges and Fields
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25 Questions

1. What is the unit of surface charge density in the SI unit?
2. An electron of mass m is kept in a vertical electric field of magnitude E. What must be the value of E so that the electron doesn’t fall due to gravity?
3. The amount of force exerted on a unit positive charge in an electric field is known as _____
4. Which among the following is false about electric field lines?
5. The electric field lines diverge from _______
6. How many electrons must be added to an isolated spherical conductor of radius 20cm to produce an electric field 1000N/C just outside the surface?
7. What is the dimension of the dipole moment?
8. What number of electrons will flow in one minute through a conductor that carries 1 Ampere current?
9. Two cylindrical pipes having radius 2m and 5m are placed coaxially. The inner cylinder has total charge 1C and the outer sphere has total charge 2C. What will be the nature of electric field intensities at different distances from the axis of the cylinders?
10. Two charges q1, q2 exert some amount of force on each other. What will happen to the force on q1 if another charge q3 is brought close to them?
11. Current carrier in conductors is ____
12. Two negative charges are kept at a certain distance in the air medium. What will happen if a dielectric slab is inserted between them?
13. Electric field intensity at the center of a square is _____ if +20 esu charges are placed at each corner of the square having side-length as 10 cm.
14. Let B be the midpoint of AC. Two point charges Q are placed at A and C. What should be the value of charge placed at B so that the system remains at equilibrium?
15. Electric field due to a uniformly charged hollow sphere at a distance of r (where r is greater than the radius of the sphere) is __________
16. At 'Electrical Neutral Point' the lines of force _______
17. 1 dyne/esu = _____ N/C
18. What should be the shape of a conductor that can hold a charge for long?
19. Two point charges +4q and +q are kept at a distance of 30 cm from each other. At which point between them, the field intensity will be equal to zero?
20. It is observed that N number of field lines come out perpendicularly from the unit surface area of the sphere. What is the amount of charge inside the sphere? ∈ is the dielectric constant of the medium.
21. Which among the following cannot be the charge of a charged body?
22. Electric field inside a hollow conducting sphere ______
23. If the force acting on a point charge kept on the axis of an electric dipole is F, what will be the amount of force if the distance of the point charge is doubled from the dipole?
24. What is the dimension of volume charge density?
25. Which one is the correct expression of electric flux?

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