Physics · Electrodynamics
A long rectangular metallic loop of width W and length L (L ≫ W) starts entering a region where there is a uniform magnetic field B perpendicular to the plane of the loop. The resistance of the loop is R and its mass is M. If v0 is the velocity of the loop just before entering the region, then neglecting self-inductance effects, the velocity at a later time t is:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1v(t) = v01 + B2 W2MR t
- 2v(t) = v01 + (B2 W2MR t)2
- 3v(t) = v0 exp(-B2 W2MR t)✓
- 4v(t) = v01 + ln(1 + B2 W2MR t)
Correct answer
v(t) = v0 exp(-B2 W2MR t)
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