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Question

An electric dipole is placed perpendicular to an infinite line of charge at some distance as shown in figure. Identify the correct statement.
222280_92538df8df234427ae7cfeace5cc4086.png
  1. The dipole is repelled away from the line charge
  2. The dipole does not experience a force
  3. The dipole is attracted towards the line charge
  4. The dipole experiences a force as well as a torque

A
The dipole is repelled away from the line charge
B
The dipole does not experience a force
C
The dipole is attracted towards the line charge
D
The dipole experiences a force as well as a torque
Solution
Verified by Toppr

The direction of dipole is from negative charge to positive charge.
So from figure, the -ve charge of dipole is nearer to infinite line of charge than the +ve charge of dipole.
so, the force on -ve charge of dipole towards line charge is more than that on +ve charge of dipole away from the line charge. So net force on dipole is towards the line charge.
So option A is correct and B and C is incorrect.
The net force is along the axis of dipole so there is no torque produced due to this force.
So option D is incorrect.

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