Problem Set 9.pdf

Problem Set 9.pdf - Physics141/151 ProblemSet9 1.....

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Physics 141/151 Problem Set 9 1. The inductor has inductance 0.260H and carries a current in the direction shown that is decreasing a uniform rate, ݀ܫ/݀ݐ ൌ െ0.0180A/s . a) Find the self induced emf b) Which end of the inductor, ܽ or ܾ , is at a higher potential? 2. a) A long straight solenoid has ܰ turns, uniform cross sectional area ܣ and length ݈ . Shown that the inductance of this solenoid is given by ܮ ൌ ߤ ܣܰ . Assume that the magnetic field is uniform inside the solenoid and zero outside. b) A metallic laboratory spring is typically 5.00cm long and 0.150cm in diameter and has 50 coils. If you connect such a spring in an electric circuit, how much self inductance must you include for it if you model it as an ideal solenoid? 3. A solenoid is 25.0cm long and with a cross sectional area of 0.500cm contains 400 turns of wire and carries a current of 80.0A . Calculate a) the magnetic field in the solenoid b) the total energy contained in the coil’s magnetic field 4. A 7.50nF
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