The resistances of three parts of a circular loop are as shown in the figure. The magnetic field at the centre $O$ is :-
The resistances of three parts of a circular loop are as shown in the figure. The magnetic field at the centre $O$ is :-
- A
$\frac{{{\mu _0}I}}{{6a}}$
- B
$\frac{{{\mu _0}I}}{{3a}}$
- C
$\frac{2}{3}\frac{{{\mu _0}I}}{a}$
- D
Zero
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