A conducting wire carrying current is arranged as shown. The magnetic field at ‘O’ is:

Question

$\frac{\mu_0 i}{12} \left[ \frac{1}{R_1} - \frac{1}{R_2} \right]$

$\frac{\mu_0 i}{12} \left[ \frac{1}{R_1} + \frac{1}{R_2} \right]$

$\frac{\mu_0 i}{6} \left[ \frac{1}{R_1} - \frac{1}{R_2} \right]$

$\frac{\mu_0 i}{6} \left[ \frac{1}{R_1} + \frac{1}{R_2} \right]$

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