Home › JEE Main › Physics › Moving Charges and Magnetism › A magnetic dipole of moment m in field B has pot…
A magnetic dipole of moment m in field B has potential energy:
Am B
B-m · B (minimum -mB when aligned)
Cm B sin theta
Dm + B
Answer & Solution
Correct answer: B. -m · B (minimum -mB when aligned)
U = -m · B = -mB cos theta. Minimum (most stable) when m parallel to B (U = -mB). Maximum (least stable) when m anti-parallel (U = +mB). Compass needle aligns to minimize PE.
Related questions
An electron and a proton enter a magnetic field with the same kinetic energy, perpendiculaA galvanometer is converted into an ammeter of higher range by connecting:The work done by a static magnetic force on a moving charge is:Magnetic field at a point on the axis of a circular loop, far from the loop (distance x ≫ The dimensional formula of the magnetic field B (in SI units of tesla) is:A cyclotron of magnetic field B accelerates positive charges of mass m, charge q. The cyclTorque on a magnetic dipole (current loop) of moment m placed in a uniform field B at anglTwo long parallel wires carry currents I₁ and I₂ in the SAME direction, separated by dista