We may define electrostaticpotential at a point in an electrostatic field as the amountof work donein movinga unit positivetest chargefrom infinity to thatpoint againstthe electrostatic forces, along any path. Due to a singlecharge q , potentialat a pointdistantr from the charge isV = (q)/(4pi in_(0)r). The potential can be positiveor negative. However, it isscalar quantity. The total amountof work done in bringingvariouscharges to theirrespective postionsfrom infinelty large mutual separations gives us the electric potential energy of the system of charges. Whereas electric potentail is measured in volt, electricpotential energy is measuredin joule. You aregivena square of each side 1.0 metre with four charges +1xx10^(-8) C, -2xx10^(-8)C, +3xx10^(-8)C and +2xx10^(-8) C placed at the four corners of the square. Withthe helpof the passagegiven above, choose the most appropritealternative for each of the followingquestions : Electric potentail and electric potential energy