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Magnetic Field Due to Finite Wire

In the given ...

Question

In the given diagram, two long parallel wires carry equal currents in opposite direction. The magnetic field B at O (origin) is non-zero along:

A

x, y and z-axis

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B

x-axis

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C

y-axis

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D

z-axis

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Solution

The correct option is D z-axis
From Right hand rule, magnetic field at O due to wire on the left is inside the paper and due to the wire on the right is also inside the paper.
Hence, no component of magnetic field is in x or y direction and the only remaining component is in z-direction.

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