In a toroid the number of turns per unit length is $1000$ and current through it is $\frac{1}{4 \pi}$ ampere. The magnetic field produced inside (in $weber / m ^2$ ) will be
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(c)
$n=1000 \quad I=\frac{1}{4 \pi} A$
$B=\mu_0 n i=4 \pi \times 10^{-7}(1000) \times \frac{1}{4 \pi}$
$B=10^{-4}( T )$
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