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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. Find the electric field intensity at 10cm away from a point charge of 100 esu.
2. At 'Electrical Neutral Point' the lines of force _______
3. What is the unit of electric flux?
4. Insulation breakdown may occur at _______
5. According to band theory, what are the true nature of the valence band and conduction band in conductors?
6. If the force between two charges is 9N, what will be the force if the distance between them is doubled and both the charges are increased to √2 times?
7. Gauss's Law cannot be applied in ________
8. Current carrier in conductors is ____
9. What is the C.G.S. unit of charge?
10. 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?
11. 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?
12. 1 dyne/esu = _____ N/C
13. A charged conductor has its charge only on its outer surface. This statement is true for which of the following?
14. Two negative charges are kept at a certain distance in the air medium. What will happen if a dielectric slab is inserted between them?
15. A charge is distributed along an infinite curved line in space with linear charge distribution λ. What will be the amount of force on a point charge q kept at a certain distance from the line?
16. Consider the lines of force as shown in the figure. Two unit positive charges are kept at points A and B.
17. 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.
18. Two point charges of the same polarities are hung with the help of two threads and kept close. The angle between the threads will be _________ if the system is taken to space.
19. Electric field outside this Gaussian surface will be ___________
20. 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?
21. Two electric field lines ______
22. Electric field inside a hollow conducting sphere ______
23. A charge is being induced to a sphere with the help of another charged sphere. The extent of induction increase if ____________
24. If electric field intensity at a certain distance from a dipole on its axis is E1 and at the same distance but on the perpendicular bisector of the dipole is E2, then __________
25. 1 Coulomb = ________ Electro Static Unit.

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