The magnetic field at the centre of current carrying coil is
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(a) Magnetic field at the centre of current carrying coil is
$B = \frac{{{\mu _0}}}{{4\pi }} \cdot \frac{{2\pi ni}}{r} = \frac{{{\mu _0}ni}}{{2r}}$
$B = \frac{{{\mu _0}}}{{4\pi }} \cdot \frac{{2\pi ni}}{r} = \frac{{{\mu _0}ni}}{{2r}}$
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