Question
Download Solution PDFHow does a dipole behave when it is placed in a uniform magnetic field?
This question was previously asked in
RPF Constable 2024 Official Paper (Held On 03 Mar, 2025 Shift 2)
Answer (Detailed Solution Below)
Option 1 : It experiences torque but no net force.
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Download Solution PDFThe correct answer is It experiences torque but no net force..
Key Points
- A dipole in a uniform magnetic field experiences torque due to the interaction between the magnetic field and the magnetic moments.
- The torque acts to align the dipole with the magnetic field direction.
- There is no net force acting on the dipole in a uniform magnetic field as the forces on the two poles of the dipole are equal and opposite, canceling each other out.
- The magnitude of the torque is given by τ = pE sin θ, where p is the dipole moment, E is the electric field, and θ is the angle between p and E.
Additional Information
- Magnetic Dipole Moment:
- It is a measure of the strength of a magnetic source.
- It is a vector quantity with both magnitude and direction.
- Uniform Magnetic Field:
- A magnetic field that has the same strength and direction at all points.
- Examples include the Earth's magnetic field over small regions and the magnetic field inside a solenoid.
- Torque on a Dipole:
- Torque is the rotational equivalent of force.
- It causes the dipole to rotate and align with the magnetic field.
- The formula for torque is τ = pE sin θ.
- Electric Dipole:
- Consists of two equal and opposite charges separated by a distance.
- It creates an electric field with a characteristic pattern.
Last updated on Jun 2, 2025
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