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Q.

We have two electric dipoles. Each dipole consists of two equal and opposite point charges at the ends of an insulating rod of length d. The dipoles sit along the x-axis a distance r apart, oriented as shown in figure.  Their separation r >> d. The dipole on the left:

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a

will feel a force to the left

b

will feel a force to the right

c

will feel a torque trying to make it rotate counterclockwise

d

will feel no torque

answer is A.

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Detailed Solution

E1, and E2are the electric fields due to dipole (1) so E1, , E2. Force on dipole  (2): qE1( left )+qE2( right )=qE1−E2left. Dipole (2) will not experience any torque, because lines of action of bothforces are same.
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