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Physics
A circular wire of radius r carries a current i. If the magnitude of magnetic field at the center is B, then the value of i is
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Q. A circular wire of radius r carries a current i. If the magnitude of magnetic field at the center is B, then the value of i is
A
$\frac {2\pi Br}{\mu_o}$
B
$\frac {Br}{\mu_o}$
C
$\frac {\pi Br}{\mu_o}$
D
$\frac {2Br}{\mu_o}$
Solution:
$B = \frac{\mu_o i }{2r}$
$I = \frac {2Br}{\mu_o}$