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MHT CET 2019 2nd May Morning Shift
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The magnitude of the magnetic induction at a point on the axis at a large distance ( $r$ ) from the centre of a circular coil of ' $n$ ' turns and area ' $A$ ' carrying current ( $I$ ) is given by

A
$B_{\text {axis }}=\frac{\mu_0}{4 \pi} \cdot \frac{n A}{1 r^3}$
B
$B_{\text {axis }}=\frac{\mu_0}{4 \pi} \cdot \frac{2 n l A}{r^3}$
C
$B_{\text {axis }}=\frac{\mu_0}{4 \pi} \cdot \frac{2 n l}{A r^3}$
D
$B_{\text {axis }}=\frac{\mu_0}{4 \pi} \cdot \frac{n l A}{r^3}$
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