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Solenoid and Toroid...

Solenoid and Toroid

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A toroidal solenoid with an air core has an average radius of 15 cm , area of cross-section 12 "cm"^(2) and 1200 turns . Ignoring the field variation across the cross-section of the toroid the self-inductance of the toroid is

A toroidal solenoid with an air core has an average radius of 15 cm, area of cross-section 12 cm^(2) and 1200 turns. Obtain the self inductance of the toroid. Ignore field variations across the cross-section of the toroid. (b) A second coil of 300 turns is wound closely on the toroid above. If the current in the primary coil is increased from zero to 2.0 A in 0.05 s, obtain the induced e.m.f. in the second coil.