Field at the centre of a circular coil of radius $r$, through which a current $I$ flows is
ADirectly proportional to $r$
BInversely proportional to $I$
CDirectly proportional to $I$
DDirectly proportional to ${I^2}$
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CDirectly proportional to $I$
c (c) Field at the centre of a circular coil of radius $r$ is $B = \frac{{{\mu _o}I}}{{2r}}$
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