Home
Class 12
PHYSICS
Two identical metals balls with charges ...

Two identical metals balls with charges `+2Q` and `-Q` are separated by some distance and exert a force `F` on each other . They are joined by a conducting wire , which is then removed. The force between them will now be

A

F

B

F/2

C

F/4

D

F/8

Text Solution

Verified by Experts

The correct Answer is:
C
`F=k (2Q^2)/d^2` Charge on each ball `=1/2 (2Q-Q)=Q/2`
Force now become `=k (Q//2)^2/d^2=1/4k Q^2/d^2=r/8`
Promotional Banner

Similar Questions

Explore conceptually related problems

Two identical metal spheres having charges +q and +q respectively. When they are separated by distance r, exerts force of repulsion F on each other. The spheres are allowed to touch and then moved back to same separation. The new force of repulsion will be

Two charge spheres separated at a distance d exert a force F on each other. If they are immersed in a liquid of dielectric constant K=2, then the force (if all conditions are same) is

Two identical conducting balls A and B have charges- Q and + 3Q respectively. They are brought in contact with each other and then separated by a distance d part. Find the nature of the Coulomb force between them.

Two charges of equal magnitudes and at a distance r exert a force F on each other. If the charges are halved and distance between them is doubled, then the new force acting on each charge is

Two identical small conducting spheres having unequal positive charges q_1 and q_2 are separated by a distance r. If they are now made to touch each other and then separated again to the same edistance, the electrostatic formce between them in this case will be