Electric Charges and Fields Class 12 MCQs Questions with Answers

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

2. 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

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

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

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

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

7. 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 :

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

9. Static electricity is produced by

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

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

12. Electric field in a cavity of metal:

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

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

15. 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?

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

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

18. 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

19.  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

20. 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: