Related Mcqs:

1. The force between two charges is 120 N. If the distance between the charges is doubled, the force will be________________?

   A. 60 N
   B. 30 N
   C. 40 N
   D. 15 N

2. Electric force between two point charges in air or vacuum is F. If we replace air or vacuum by an insulator (dielectric) of relative permitivity Cr the force between the charges will_______________?

   A. decrease
   B. increase
   C. remain constant
   D. depends upon composition of dielectric

3. Two similar charges each of one coulomb placed in air one meter apart repel each other with a force______________?

   A. 9 x 109N
   B. 9.2 x 104N
   C. 9 x 109N
   D. 9 x 107N

4. Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become_____________?

   A. 1/4th of its original value
   B. 1/8th of its original value
   C. 4 times of its original value
   D. 8 times of its original value

5. If the distance between the two point charges become half then force between them becomes______________?

   A. double
   B. half
   C. four times
   D. remains same

6. If a third equal and similar charge is placed between two equal and similar charges, then this third charge will_____________?

   A. move out of the field of influence of the two charges
   B. remain in stable equilibrium
   C. not be in equilibrium
   D. be in unstable equilibrium

7. The number of electrons in one coulomb charge is equal to_______________?

   A. 6.2 x 1018
   B. 1.6 x 1019
   C. 6.2 x 1021
   D. 1.6 x 10-27

8. A single core cable used on 33000 V has conductor diameter 10 mm and the internal diameter of sheath 25 mm. The maximum electrostatic stress in the cable is____________?

   A. 62 x 105 V/m
   B. 72 x 105 V/m
   C. 82 x 105 V/m
   D. 92 x 105 V/m

9. Two infinite parallel plates 10 mm apart have maintained between them a potential difference of 100 V. The acceleration of an electron placed between them is______________?

   A. 0.56 x 1015 m/s2
   B. 1.5 x 1015 m/s2
   C. 1.6 x 1015 m/s2
   D. 1.76 x 1015 m/s2

10. Acharge which when placed in vacuum from an equal and similar charge repels with a force of 9 x 10 N, is known as_____________?

    A. milli-coulomb
    B. micro-coulomb
    C. pico-coulomb
    D. coulomb