Physics · JEE | Moving Charges and Magnetism

What is the magnetic field at the center of a circular loop of radius \( R \) carrying steady current \( I \)?

1. A
   \( \frac{\mu_0 I R}{2} \)
2. B
   \( \frac{\mu_0 I}{4R} \)
3. C
   \( \frac{\mu_0 I}{2R} \)
4. D
   \( \frac{2\mu_0 I}{R} \)