Four point charges Q.q Q and q are placed at the corners of a square side 'a' as shown in the figures.

Find the Potential energy of this system.

Explanation

Potential energy of the system
` = (1)/( 4pi in _0) [4( pQ)/( a) +( q^(2))/( asqrt2) +(Q^(2) )/( a sqrt(2))]`
`= ( 1)/( 4pi in _0) [4qQ+( q^(2))/( sqrt2) + ( Q^(2))/( sqrt2) ]`