What is the potential at the centre of a square of each side 1.0 meter, when four charges `+1xx10^(-8)C, -2xx10^(-8) C, +3xx10^(-8)C and +2xx10^(-8)C` are placed at the four corners of the square.

Answer

`5.1xx10^(2)V`

Explanation

Diagonal of sqare `= sqrt(1^(2) + 1^(2)) = sqrt(2)`
Distance of each charge from the centre
`r = (sqr(2))/(2) = (1)/(sqrt(2))`, use `V = (Sigma q)/(4pi in_(0) r)`