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Physics-

General

Easy

Question

A positive charge Q is placed at the centre of a square of side l. Then the net force acting on the central charge Q due to the other four charges Q, 2Q ,3Q and 4Q placed at the vertices of the square is

$\frac{Q^{2}}{2 π ε_{o} l^{2}} \hat{i}$
$\frac{3 Q^{2}}{2 π ε_{o} l^{2}} \hat{j}$
$\frac{3 Q^{2}}{2 π ε_{o} l^{2}} \hat{i}$
$- \frac{\sqrt{2} Q^{2}}{π ε_{o} l^{2}} \hat{j}$

The correct answer is: $negative fraction numerator square root of 2 Q to the power of 2 end exponent over denominator pi epsilon subscript o end subscript l to the power of 2 end exponent end fraction stack j with hat on top$

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