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Class 12 Physics (Part I) Chapter 1 Electric Charges And Fields Quiz 4 (25 MCQs)

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1. 10 electric dipoles each of the dipole moment P are enclosed within a closed surface. Total electric flux linked with the surface is
2. Electric intensity, due to an electric di-pole at any point on the equatorial line is directed:
3. If a positively charged object is brought near a neutral conductor, what happens to the electrons in the conductor?
4. The electric charges are distributed in a small volume. The flux of the electric field through a surface of radius 10cm surrounding the total charge is 20 Vm.The flux over a concentric sphere of radius 20cm will be
5. Protons have a ..... charge and Electrons have a ..... charge.
6. When $10^{14}$
7. By how much is the electrical force between a pair of ions reduced when their separation distance is doubled (2x)? Tripled (3x)?
8. Electrostatic force is a ..... force.
9. Static electricity is the build up of ..... on an object by adding or removing ..... from it.
10. What are the two types of charges that objects may possess?
11. What is the magnitude of the electric field intensity at a point where a proton experiences an electrostatic force of magnitude 2.30 x 10$^{-25}$ newton?
12. In a cooking competition, what is the unit of measurement used to determine the amount of space a dish occupies?
13. When two objects have the same charge, they are (such as + and +)
14. What do we call electricity that moves from one place to another?
15. Net electrostatic field inside a positively charged conductor is .....
16. In a science fair, the solid angle subtended by a dome at its center is:
17. Gauss law is valid only for the fields which follows inverse square law.
18. An atom of oxygen has 8 protons and 10 electrons, this means the atom is .....
19. The force acting between two point charges kept at a certain distance is $\phi$
20. Electric field produced due to an infinitely long straight uniformly charged wire at perpendicular distance of 2 cm is 3 x 10$^{8}$ N/C. Then linear charge density on the wire is ..... (k = 9 x 10$^{9}$ SI)
21. Particles with opposite charges .....
22. Electric flux is the total number of electric lines of force passing through the surface
23. A hollow metal sphere of 5cm is charged, such that the potential on its surface is 10V. The potential at the centre of the sphere is:
24. Electric field intensity due to a short dipole remains directly proportional to-(r $\rightarrow$ distance of a point from centre of dipole ):-
25. If Charge Q is kept in a sphere of 5 cm first than it is kept in a cube of side 5 cm, then the outgoing flux will be:
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