Question

Two objects X and Y have similar charges q, they exert a force F on each other , if Z with charge -2q touches X and then removed then what is the force between X and Y?​

Answer 1

Explanation:

Initially charges on both sphere, q 

F=d2Kq2 

When sphere C will get touched with sphere A, then final charges on both will become 2q.

Now, when this sphere C will get touched to sphere B, then final charges on both of them will be 

qc=qd=2q/2+q=43q

Now force between A and B will be 

F′=d2k×2q×43q 

F′=83F