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Q.

What current should be passed through a flat circular coil of 20 cm diameter and having 100 turns to produce a magnetic induction of 3.14×10-4T  at its centre ?

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a

1.5A

b

0.5A

c

1A

d

2A

answer is D.

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Detailed Solution

BC=μ0ni2r=4π×10−7×100×i2×10×10−2=3.14×10−4
i = 0.5A

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