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Q.

A current of 1 ampere is passed through a straight wire of length 8.0 m. The magnetic field at a point in air at a distance of 5 m from either end of the wire and lying on the axis of wire will be :

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a

μ08π

b

2μo15π

c

μ04π

d

μ02π

answer is D.

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Detailed Solution

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Magnetic field at the point= μoi4π3(45+45)= 2μ015π

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