# Four point charges -Q, -q, 2q and 2Q are placed, one at each corner of the square. The relation between Q and q for which the potential at the centre of the square is zero is: Option 1) Q = -q Option 2) Option 3) Q = q Option 4)

As we learnt in

Potential of a System of Charge -

- wherein

Potential at the centre O due to given charge configuration is

-Q-q+2q+2Q=0          Q+q=0      or Q= - q

Option 1)

Q = -q

Correct

Option 2)

Incorrect

Option 3)

Q = q

Incorrect

Option 4)

Incorrect

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