A hairpin like shape as shown in figure is made by bending a long current carrying wire. What is the magnitude of a magnetic field at point P which lies on the centre of the semicircle?

Question

${{{\mu _0}I} \over {4\pi r}}(2 - \pi )$

${{{\mu _0}I} \over {2\pi r}}(2 - \pi )$

${{{\mu _0}I} \over {4\pi r}}(2 + \pi )$

${{{\mu _0}I} \over {2\pi r}}(2 + \pi )$

Solution

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