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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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will feel a torque trying to make it rotate counterclockwise

will feel a force to the left

will feel no torque

will feel a force to the right

answer is A, D.

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Detailed Solution

E₁, and E₂are the electric fields due to dipole (1) so E₁, , E₂.

Force on dipole $(2): {qE}_{1} (left) + {qE}_{2} (right) = q (E_{1} - E_{2})$ left. Dipole (2) will not experience any torque, because lines of action of both
forces are same.

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