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Q.

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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a

0.5  ×  10−5T

b

1.25  ×  10−4T

c

3  ×  10−5T

d

4  ×  10−5T

answer is B.

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Detailed Solution

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