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Question

Two infinitely long insulated wires are kept perpendicular to each other. They carry currents I1=2 A and I2=1.5 A.
i) Find the magnitude and direction of the magnetic field at P.
ii) If the direction of current is reversed in one of the wires. What would be the magnitude of the field B?

A
2×105 T, normally into the plane of the paper, 22×105 T
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B
2×105 T,normally out of the plane of the paper, 22×105 T
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C
2×105 T, normally into the plane of the paper, Zero
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D
2×105 T, normally into the plane of the paper, Zero
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Solution

The correct option is C 2×105 T, normally into the plane of the paper, Zero
B1=μ0i12πr1=2×107×24×102=105B2=μ0i22πr2=2×107×1.53×102=105B=B1+B2=105+105
=2×105, normally in to the place of the paper, zero

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