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The figure shows a point `PO` on the axis of a circular loop carrying current `I`. The corect direction of magnetic field vector at `P` due to `dI` is

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The figure shows a point `PO` on the axis of a circular loop carrying current `I`. The corect direction of magnetic field vector at `P` due to `dI` is respectively by
image
A. 1
B. 2
C. 3
D. 4
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Correct Answer - A
`dB=mu_0?(4pi)i/r^3(dIxxr)`
`:.` dB is in the direction `Ixxr`. Hence dI towards P.
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