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Magnetic field intensity at the centre of coil of 50 turns, radius 0.5 m and carrying a current of 2 A is

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0.5 × 10−5T

1.25 × 10−4T

3 × 10−5T

4 × 10−5T

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detailed solution

Correct option is B

B= μ0Ni2r= 4π× 10−7 × 50 × 22 × 0.5 = 1.25× 10−4T

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