45. A rectangular conductor coil has width L = 10 cm, resistance R = 0.3 Ω, and mass m = 100 g. Ignoring the air drag, when the coil falls in a uniform magnetic field B = 10 T, the final terminal velocity value of the coil is:
(Gravitational acceleration g = 10 m/s
2 )
(A) 0.3 m/s
(B) 0.5 m/s
(C) 0.7 m/s
(D) 3.0 m/s
(E) 5.0 m/s
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類題 帶入公式v=(0.1*10*0...
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