A uniform wire is bent in the form of a circle of radius $R$. A current $I$ enters at $A$ and leaves at $C$ as shown in the figure :If the length $ABC$ is half of the length $ADC,$ the magnetic field at the centre $O$ will be
A uniform wire is bent in the form of a circle of radius $R$. A current $I$ enters at $A$ and leaves at $C$ as shown in the figure :If the length $ABC$ is half of the length $ADC,$ the magnetic field at the centre $O$ will be
- A
Zero
- B
$\frac{{{\mu _0}I}}{{2R}}$
- C
$\frac{{{\mu _0}I}}{{4R}}$
- D
$\frac{{{\mu _0}I}}{{6R}}$
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