A current I flows in circular arc of wire which subtends an angle θ∘

Question

A current I flows in circular arc of wire which subtends an angle

θ^{\circ}

at the centre. If the radius of the circle is r then the magnetic field B at center is:

Options:

A . μ0ir

B . μ0i2r

C . 3μ0i4r

D . (θ∘360∘)μ0i2r

Answer: Option D
:
D

B = \frac{μ_{0} i}{4 π r} [θ]

B = \frac{(\frac{θ^{\circ}}{360}) μ_{0} i}{2 r}

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