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A wire carries a current I amperes shown in figure. The semicircle has a radius r. The magnetic filed at the centre C will be :

zero
$\frac{π I}{r} \times 10^{- 7}$ Newton/ampere-metre
$\frac{π I}{r}$ Newton/ampere-metre
$\frac{π I}{r}$ gauss

A

zero

B

\frac{π I}{r}

Newton/ampere-metre

C

\frac{π I}{r}

gauss

D

\frac{π I}{r} \times 10^{- 7}

Newton/ampere-metre

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Solution

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Answer is B.

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