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Question

A long vertical wire carrying a current of 1A in the upward direction is placed in a region where a horizontal magnetic field of 2.0×104T exists from south to north. Find the point where the resultant magnetic field is zero.

A
1.0mm, to the west of the wire
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B
1.0 mm, to the East of the wire
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C
2.0 mmm to the North of the wire
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D
2.0 mm, to the South of the wire
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Solution

The correct option is A 1.0mm, to the west of the wire
B=BHμ0i2πr=BH2×107×1r=2.0×104
r=103m west of the wire
= 1.0 mm west of the wire

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