Question

Fill in the blank.
Five point charges, each of value $+qC$, are placed on five vertices of a regular hexagon of side $Lm$. The magnitude of the force on the point charge of value $-qC$ placed at the centre of the hexagon is _______$N$.

Answer 1

Among the five forces on 5 charges, 2 pairs of forces are cancelled with each other since they are equal in magnitude and opposite in direction.

$\therefore F=\frac{1}{4\pi {\epsilon }_0}.\frac{q^2}{L^2}$ [Attractive in nature.]