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Four short dipoles each of dipole moment...

Four short dipoles each of dipole moment 'p' are placed at the vertices of a square of side a. The direction of the dipole moments are shown in the figure.

A

Electric field at O is `(sqrt(2) p)/(2pi in_(0) a^(3))`

B

Electric field at O is `(sqrt(2) p)/(pi in_(0) a^(3))`

C

Electrostatic potential at O is zero

D

Net dipole moment is 2p

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The correct Answer is:
B, D
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