Two identical conducting spheres having unequal positive charges q1 and q2 separated by distance r. If they are made to touch each other and then separated again to the same distance. The electrostatic force between the spheres in this case will be (neglect induction of charges)

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less than before

same as before

more than before

zero

answer is C.

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Detailed Solution

When spheres are made to touch each other, charges distribute equally. Final charge on both sphere is q1+q22Initially : F1∝q1q2Finally : F2∝q1+q224⇒F2∝q124+q224+q1q22 Thus, F2>F1

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