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Question

A long straight wire in the horizontal plane carries a current of 50 A in north to south direction. Give the magnitude and direction of B at a point 2.5 m east of the wire.

Solution
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Current, I=50A
Distance, r=2.5 m
Magnetic field, B=μoI2πr
B=4.0×106T
According to maxwell's right hand, the direction of field is upward.

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