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.