Physics · PYQ NEET UG 2026

A current \( I_0 \) flows through a metallic circular loop of radius \( r \) as shown in the figure. Resistance of the segment \( ABC \) is half that of \( ADC \). Magnitude of magnetic field at the center \( O \) of the loop is :

1. A
   \( \frac{\mu_0 I_0}{12r} \)
2. B
   \( \frac{\mu_0 I_0}{4r} \)
3. C
   \( \frac{\mu_0 I_0}{2r} \)
4. D
   \( \frac{\mu_0 I_0}{2\pi r} \)