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AP Physics C: E&M
12.1 Magnetic Fields
BeginnerMCQConceptual19.4k
A magnetic dipole aligned with a non-uniform magnetic field.
A magnetic dipole aligned with a non-uniform magnetic field.
A small magnetic dipole with magnetic dipole moment \(\vec{\mu}\) directed in the \(+x\)-direction is placed in a non-uniform magnetic field \(\vec{B}\) that points in the \(+x\)-direction. The magnitude of the magnetic field increases along the \(x\)-axis such that \(\dfrac{dB}{dx} > 0\). The dipole is released from rest.

Which option correctly identifies the direction of the net magnetic force on the dipole and the change in magnetic potential energy \(U\) of the dipole-field system immediately after release?

OptionDirection of Net ForceMagnetic Potential Energy \(U\)
A\(+x\)-directionDecreases
B\(+x\)-directionIncreases
C\(-x\)-directionDecreases
D\(-x\)-directionIncreases

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