Question

The net electric force on a charge of $+3\,\mu C$ at the mid-point on the line joining two charges of magnitude $+2\,\mu C$ and $-2\,\mu C$ separated by the distance of $6\,mm,$ is

• A. 6000 N
• B. 500 N
• C. 60 N
• D. zero

Answer 1

Answer: (D)

zero

Answer 2

From Coulomb's law Force due-to same charge is repulsive and that due to opposite is attractive.
$F=K\left[\frac{2 \times 3}{3^{2}}-\frac{2 \times 3}{3^{2}}\right]=0$