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The heating coils in a hair dryer are 0.975 cm in diameter, have a combined length...

The heating coils in a hair dryer are 0.975 cm in diameter, have a combined length of 0.85 m, and a total of 400 turns.

a)What is their total self-inductance, assuming they act like a single solenoid, in H?

b)How much energy is stored in them when 6.25 A flows in J?

c)What average emf in mV opposes shutting them off if this is done in 5.00 ms (one-fourth of a cycle for 50 Hz AC)?

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