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  4. The magnitude of magnetic induction at mid point O due to current arrangement as shown in Fig will be

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Q. The magnitude of magnetic induction at mid point $O$ due to current arrangement as shown in Fig will bePhysics Question Image

JEE MainJEE Main 2023Moving Charges and Magnetism

Solution:

Magnetic field due to current in BC and ET are outward at point ' $O$ '
$B _0=\frac{\mu_0 i }{4 \pi r }+\frac{\mu_0 i }{4 \pi r }=\frac{\mu_0 i }{2 \pi r }=\frac{\mu_0 i }{\pi a }$