Target Exam

CUET

Subject

Physics

Chapter

Electric Charges and Fields

Question:

An electric dipole is kept in an electric field which is increasing in +x direction. The dipole moment of the dipole is also along the +x direction. Which of the following options is correct for the electric dipole.

Options:

Electric dipole will not experience any force in the presence of the electric field ($\vec E$).

Electric dipole will experience force and try to align perpendicular to the direction of electric field ($\vec E$).

Electric dipole will experience a net force in +x direction.

Electric dipole will experience a net force in -x direction.

Correct Answer:

Electric dipole will experience a net force in +x direction.

Explanation:

The correct answer is Option (3) → Electric dipole will experience a net force in +x direction.

Given: Electric field $\mathbf{E}$ increases along +x, and dipole moment $\mathbf{p}$ is also along +x.

Force on positive charge: $+qE_+$ (toward +x)

Force on negative charge: $-qE_-$ (toward −x)

Since $E_+ > E_-$, net force acts in the direction of increasing field, i.e. +x direction.

Therefore, the dipole experiences:

• No torque (because $\mathbf{p} \parallel \mathbf{E}$)

• A net force in the +x direction

Hence, the dipole experiences a net force along +x but no torque.