Question

A toroid has a core (non-ferromagnetic) of inner radius 23 cm and outer radius 28 cm, around which 4000 turns of a wire are wound. If the current in the wire is 9 A, find the magnetic field (a) inside the core of the toroid (b) outside the toroid?

A 2.82.0 × 10^-2 T (b) 0
B (a)3.0 × 10^-2 T (b) 0.5
C (a) 28.2 T (b) 0
D (a)0.82.0 × 10^-3 T (b) 0.5
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