A positive and a negative charge are initially 50 mm apart. When they are moved close together so that they are now only 10 mm apart, the force between them will be________________?

Related Mcqs:

1. The electric charge of 100 °C is 13cm apart from another charge 16.9°C electric force between them is_____________?

   A. 9x107N
   B. 900N
   C. 9x105N
   D. 9x106N

2. 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

3. 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

4. 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

5. 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

6. The direction of electric field due +0 positive charge is ___________?

   A. away from the charge
   B. towards the charge
   C. both A. and (6)
   D. none of the above

7. Potential difference is the work done in moving unit positive charge form one point to another________________?

   A. in the direction of electric intensity
   B. against electric intensity
   C. in any direction
   D. in the direction of electric flux

8. 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

9. The force per unit charge is know as__________________?

   A. electric flux
   B. electric intensity
   C. electric potential
   D. all of above are same

10. 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