A conducting rod of length can slide without friction down a pair of conducting rails…

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A 0.20 kg0.20\,\text{kg} conducting rod of length 0.40 m0.40\,\text{m} can slide without friction down a pair of conducting rails that are inclined at 25∘25^{\circ} above the horizontal. The rails are connected at the bottom through a 2.0 Ω2.0\,\Omega resistor. A uniform magnetic field of 1.2 T1.2\,\text{T} is perpendicular to the plane of the rails. After the rod is released from rest, it quickly reaches a constant terminal speed. Neglect air resistance. What is the magnitude of this terminal speed? (a) 3.6 m/s3.6\,\text{m}/\text{s} (b) 15 m/s15\,\text{m}/\text{s} (c) 7.2 m/s7.2\,\text{m}/\text{s} (d) 2.9 m/s2.9\,\text{m}/\text{s}

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