Q. Two identical conducting balls and have positive charges and respectively but The balls are brought together so that they touch each other and then kept in their original positions. The force between them is

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A

Less than that before the balls touched

B

Greater than that before the balls touched

C

Same as that before the balls touched

D

Zero

Solution:

Original charges on spheres and be respectively.
Distance between the two spheres
Since, both the spheres are of same size, they will possess equal charges on being brought in contact.

Similarly
Therefore, new force of repulsion between spheres is

As

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