Physics

Problem

Four point charges are placed successively along a straight line at equal separations of

5\,\text{cm}

+2\,\mu\text{C}

-3\,\mu\text{C}

+4\,\mu\text{C}

and

-2\,\mu\text{C}

. Determine the net electrostatic force (magnitude and direction) on the

+4\,\mu\text{C}

charge.