Question

1). Two identical small metal spheres having charges
q and -3q exert force F on each other. The
spheres are touched with each other and then kept
at the same separation. The magnitude of the new
force between the spheres will be

A. (4/3) F
B. 4F
C. 2F
D. F/3​

Answer 1

Answer:

Explanation:

D

Answer 2

The magnitude of the new force between the spheres will be F/3

Explanation:

Consider

Va = $\frac{q1}{4π∈r}$ + $\frac{q1 - q2}{4π∈d}$

solving further

the force we get will be

F2 = F/3