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4 charges are placed each at a distance ...

4 charges are placed each at a distance `a` from origin . The dipole moment of configuration is .
.

A

`2qa hat(j)`

B

`3q a hat(j)`

C

`2aq(hat(i)+hat(j))`

D

`2aq(hat(i)-hat(j))`

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The correct Answer is:
A
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