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

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Q. 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

J & K CETJ & K CET 2013Electric Charges and Fields

Solution:

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