Question

plZ ans this question Pls pls pls​

Answer 1

◾Let Q be the initial charge on the spheres.

Force:

$f = \frac{k {Q}^{2} }{ {r}^{2} }$

◾When sphere C is attached to sphere A than net charge on the both spheres ( A & C ) is..

$( \frac{Q + 0}{2}) = \frac{Q}{2}$

◾Now, when sphere C containing

$\frac{Q}{2}$

charge is attacked with sphere B ( containing Q charge)

◾the net charge on the sphere B & C...

$= ( \frac{ \frac{Q}{2} +Q }{2} ) = \frac{3Q}{4}$

◾then force between A & B...

$f_{1} = \frac{ \frac{kQ}{2} \times \frac{3Q}{4} }{ {r}^{2} } = \frac{k {Q}^{2} }{ {r}^{2} } \times \frac{3}{8} \\ = \frac{3f}{8}$

so, option (a) is correct.

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