Exam 20: Induced Voltages and Inductance

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An air-core inductor has 2000 turns/m and an internal volume of 1.3 cm3.What is its inductance?

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An electric motor draws a current of 2.30 A from a 13.0-V battery when it runs at normal speed.If the motor's armature is "jammed" so that it cannot rotate,the current suddenly rises to 11.7 A.What is the back emf of the motor when running at normal speed?

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By what factor is the self-inductance of an air solenoid changed if only its number of coil turns,N,is tripled?

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