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Four equal charges are kept fixed on the...

Four equal charges are kept fixed on the vertices of a square of side 'a'. A charge `q_1` is kept at the centre of the square as shown in the figure . Then

A

charge `q_1` is always in stable equilibrium

B

charge `q_1` cannot be in stable equilibrium

C

charge `q_1` is always in stable equilibrium only if `q_1`, and the charges on the vertices of the square have different signs

D

charge `q_1` is always in stable equilibrium only if `q_1`, and the charges on the vertices of the square have same signs

Text Solution

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The correct Answer is:
B
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