An electric dipole is placed perpendicular to an infinite line of charge at some distance as shown in figure. Identify the correct statement.

The dipole is attracted towards the line charge

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The dipole is repelled away from the line charge

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The dipole does not experience a force

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The dipole experiences a force as well as a torque

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Solution

The correct option is C The dipole is attracted towards the line charge
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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