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Q.

Two identical conducting balls have positive charges $q_{1} q_{2}$ respectively. The balls are brought together so that they touch and then put back in their original positions. The force between the balls may be

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a

zero

b

Less than the force before the balls had been touched.

c

Greater than the force before the balls had been touched

d

The same as it was before the balls had been touched.

answer is B.

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Detailed Solution

After the spheres touch each other , charge on each sphere becomes $\frac{(Q_{1} + Q_{2})}{2}$

Now $F_{1} \infty Q_{1} Q_{2} a n d F_{2} \infty \frac{{(Q_{1} + Q_{2})}^{2}}{4}$

Therefore $F_{2} - F_{1} = k \frac{{(Q_{1} - Q_{2})}^{2}}{4} > 0$

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Two identical conducting balls have positive charges q1 q2 respectively. The balls are brought together so that they touch and then put back in their original positions. The force between the balls may be