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By solenoid with inductance of 0.1 GN and 10 Ohm impedance flows a constant current. The ends of the solenoid disconnected from the source and shorts. Over what period of time the solenoid will stand out amount of heat equal to half the initial value of the magnetic field of the solenoid power?
Task 30875. Detailed solution with a short recording conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.
If you have any questions about the decision to write. I try to help.

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