First slide

Magnetic field due to a current carrying circular ring

Question

Magnetic field at point A would be :

Moderate

A

$\frac{μ_{0} I}{4 π}$
B

$\frac{μ_{0} I}{4 R}$
C

$\frac{μ_{0} I}{4 πR}$
D

zero

Solution

full circular ring gives the magnetic field as $\frac{μ_{o} i}{2 R}$
while semicircular ring gives it as $\frac{μ_{o} i}{4 R}$
Magnetic field due to straight wires if zero as the perpendicular distance of the point from the wire is zero

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