Four positive charges are fixed at the corners of a square as shown.
The total potential at the centre of the square, a distance d from each charge, $\frac{\text{5Q}}{\text{4πε$_0$d}}$ is.
Three of the charges have a charge of +Q.
What is the magnitude of the fourth charge?

1 )
-$\frac{\text{7Q}}{4}$
2 )
Q
3 )
√2Q
2Q
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