Electric Charges and Fields Class 12 MCQs Questions with Answers

1. The electric field inside a spherical shell of uniform surface charge density is

2. If sphere of bad conductor is given charge then it is distributed on:

3. Static electricity is produced by

4.  Which of the following statements is not true about Gauss’s law?

5. When two charged spheres are connected with a wire, the electric charge on them is shared:

6. Electric field in a cavity of metal:

7.  A charge Q is divided into two parts of q and Q – q. If the Coulomb repulsion between them when they are separated is to be maximum, the ratio of Q/q should be

8. Two point charges each of 20 µC are placed 50 cm apart in air. What is the electric field intensity at the mid point on the line joining the centre of two point charges?

9. In comparison With the electrostatic force between two electrons, the electrostatic force between two protons is:

10. The work done in rotating an electric dipole in an electric field:

11. If electric flux through a closed surface is zero. It means that:

12. The surface considered for Gauss’s law is called

13. Three charges + 3q + q and Q are placed on a st. line with equal separation. In order to maket the net force on q to be zero, the value of Q will be :

14. Which one of the following is the unit of electric field?

15. Electric field at a point varies as r° for

16. The number of electron-taken out from a body to produce 1 coulomb of charge will be :

17. When the distance between two charges is reduced to one-half of the original distance, the force between them will remain the same if one of the charges is made:

18. Two similar spheres having +Q and -Q charges are kept at a certain distance. F force acts between the two. If at the middle of two spheres, another similar sphere having +Q charge is kept, then it experiences a force in magnitude and direction as

19. If an electric dipole is kept in a uniform electric field then the resultant electric force on it is :

20. A unit Coulomb charge is one which when placed in air at a distance of 1 m from an equal and similar charge repel it with a force of