Charges and are fixed at points A and B

PHYSICS · Subjective · CBSE · Physics · Electric Charges and Fields · Electric Charges and Fields

Problem

Charges

+4\,\mu\text{C}

and

+1\,\mu\text{C}

are fixed at points A and B, respectively,

20\,\text{cm}

apart in air. A third point C is located on AB,

10\,\text{cm}

from A. Determine the magnitude and sign of a charge

q

that must be placed at C so that the net electrostatic force on the charge at B is zero.