precision laboratory resistor is made of a coil of wire. The coil is 1.3 cm in diameter, 4.25 cm long, and has 500 turns. Part (a)  What is its self-inductance in millihenries?  Part (b)  What average emf in volts is induced if a 12.0 A current through it is turned on in 5.00 ms (one-fourth of a cycle for 50 Hz AC)?  Part (c)  What is its inductance in millihenries if it is shortened to half its length and its 500 turns are counter-wound (wound as two oppositely-directed layers of 250 turns each

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