What is the self-inductance of a toriod of inner radius 5cm, Ask an Expert

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What is the self-inductance of a toriod of inner radius 5cm, outer radius 15cm, 10,000 turns. If the emf induced is 5 volts rms and the rate of current change is 0.5 amp/sec. What is the magnetic field at 8cm from the center for a current of 5 ampere?

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