A straight section PQ of a circuit lies along the X-axis from x= −a2 to x= a2 and carries a steady current i. The magnetic field due to the section PQ at a point X = + a will be

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Proportional to a

Proportional to a2

Proportional to 1/a

Zero

answer is D.

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Detailed Solution

Magnetic field at a point on the axis of a current carrying wire is always zero.

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