MHT CET 2022 Physics question
A toroid is a long coil of wire (N turns) wound over a circular core. The coefficient of self induction of the toroid is [The magnetic field in it is uniform and R >> r where r radius of wire, R = radius of coil] ( = permeability of free space)
Answer: (D)
Solution
Field inside the toroid (uniform since ): . Flux linked with the turns: . Since , the self-inductance is $L =
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