The ratio of magnetic field at the centre of a current carrying cir...

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The ratio of magnetic field at the centre of a current carrying circular wire of radius \( R \) and at a distance \( R \) from centre on its axis is
(1) \( 2 \sqrt{2} \)
(2) 2
(3) \( \sqrt{2} \)
(4) 4
\( \mathrm{P} \)
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