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Q.

In a wire of circular form has 4A current is flowing to have a magnetic induction as 1µT , at its centre. The radius of circle should be approximately

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a

2.5mm

b

25cm

c

2.5m

d

2.5cm

answer is A.

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Detailed Solution

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B=μ0i2r⇒10−6=4π×10−7×42×r,r=8×10-1πm=2.5m

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