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Question:

The change in the magnetic dipole moment associated with the orbit, at the end of time interval of the magnetic field change, is

−γBQR²

−γBQR²²

γBQR²²

γBQR²

Solution:

ΔL = ∫τdt = Q(R²B)R(1) = QR²B/2, in magnitude
Δμ = γΔL = −γBQR²/2 (taking into account the direction)