Physics

Problem

0.20\,\text{kg}

conducting rod of length

0.40\,\text{m}

can slide without friction down a pair of conducting rails that are inclined at

25^{\circ}

above the horizontal. The rails are connected at the bottom through a

2.0\,\Omega

resistor. A uniform magnetic field of

1.2\,\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\,\text{m}/\text{s}

15\,\text{m}/\text{s}

7.2\,\text{m}/\text{s}

2.9\,\text{m}/\text{s}

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