Question

Five identical charges q are placed on the equidistant on a semicircle as shownAnother point charge q is kept at the center of the circle of radius R. Calculate the electrostatic force

Answer 1

Force on the centre particle by any charge is given by

F=kq*q/R²

F net=5*F     (as all points are at the same distance)

F net=5kq²/R²

hope this helps