A toroidal solenoid with 400 turns and mean radius of 4.0 cm has air core. The current in the winding that is required to set up a magnetic field of 4.0 m T in the air core is

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0.5A

1.0 A

1.5 A

2.0 A

answer is D.

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Detailed Solution

11600×24 ≃ 26μAμoN2πri = B2×10−7×4004×10−2 ×i = 4×10−3 i = 2A

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