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A straight section PQ of a circuit lies ...

A straight section `PQ` of a circuit lies along the `X`-axis from `x=-a/2` to `x=a/2` and carriers a steady current `i`. The magnetic field due to the section `PQ` at a point `X=+a` will be

A

Proportional to `a`

B

Proportional to `a^(2)`

C

Proportional to `1//a`

D

Zero

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The correct Answer is:
D
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