15_Chapter 20 HomeworkCH20 Induced Voltages and Inductance

15_Chapter 20 HomeworkCH20 Induced Voltages and Inductance...

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Induced Voltages and Inductance 189 (c) The emf is first maximum at 0.50 s 0.13 s 44 T == = t 20.36 Treating the coiled telephone cord as a solenoid, () 2 2 72 2 0 6 41 0 T m A 7 0 . 0 1 . 3 0 1 0 4 0.600 m 1.36 10 H 1.36 H NA L π µ −− ×⋅ × = A 20.37 -3 2 av 1.50 A 0.20 A 3.00 10 H 2.0 10 V 20 mV 0.20 s I L t ∆−  ==× = × =   E 20.38 The units of B N I Φ are 2 Tm A From the force on a moving charged particle, F qvB = , the magnetic field is F B and we find that qv = NN 1 T 1 1 Cm s s ⋅⋅ Thus, ( ) 22 Nm s Ns J m C C ⋅= = s Vs =
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