We have two identical electric dipoles. Each dipole consists of two equal and opposite point charges at the end of an insulating rod of length d. The dipoles are placed on the x-axis at a large distance r apart, oriented as shown below. There is only mutual electrostatic force between the dipoles. Mark the correct statement(s) :

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The dipole on the left will feel a force upwards $(↑)$ and a torque trying to make it rotate counterclockwise.

Angular momentum of the two dipole system is not conserved.

Angular momentum of the two dipole system is conserved, because there is no external torque on the system.

The dipole on the right will feel a force downwards and a torque trying to make it rotate counterclockwise.

answer is A, B, D.

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Detailed Solution

$F_{n e t}$ on left dipole is upwards and its reaction on right dipole is downwards. Both the dipoles rotate anticlockwise about their COM. Due to motions of COM of the dipoles individually, some angular momentum exists, in clockwise direction and angular momentum of system is conserved as there are no external torques.

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