A square of side has point charges arranged at its corners in the following order

PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A square of side

0.30\,\text{m}

has point charges arranged at its corners in the following order, starting from the top-left corner and moving clockwise:

+4\,\mu\text{C}

-4\,\mu\text{C}

+4\,\mu\text{C}

-4\,\mu\text{C}

. Determine the magnitude and direction of the net electrostatic force acting on a

+2\,\mu\text{C}

test charge placed at the centre of the square.