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If the magnetic induction at a distance of $\sqrt{3} r$ on the axis from the centre of the coil of radius r is 2.7 T, then its value at a distance $2 \sqrt{2} r$ from center on the axis is

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0.9T

1.8 T

0.8 T

2.7 T

answer is C.

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Detailed Solution

$B_{A} = \frac{B_{0}}{{(1 + \frac{x^{2}}{r^{2}})}^{3 / 2}}$

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