Question

Q-3- Four charges are of each 1C are kept on the corner of square of side 2M. Find the total potential energy of the system?

Answer 1

$total \: potential \: = \: 4 \times 9 \times {10}^{9} \times \frac{1 \times 1}{ {2}^{2} } + 2 \times 9 \times {10}^{9} \times \frac{1 \times 1}{ {( 2\sqrt{2} )}^{2} } \\ = 1.125 \times {10}^{10} jule.$
does the answer matches ???