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 ?
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 ?
- [JEE MAIN 2021]
- A
$\frac{\mu_{0} I }{4 \pi r }(2-\pi)$
- B
$\frac{\mu_{0} I }{4 \pi r }(2+\pi)$
- C
$\frac{\mu_{0} I }{2 \pi r }(2+\pi)$
- D
$\frac{\mu_{0} I }{2 \pi r }(2-\pi)$
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