The Magnitude of the Magnetic Field at Point P, at the Center

Multiple Choice

The magnitude of the magnetic field at point P, at the center of the semicircle shown, is given by:

A) 2 $\mu$ _0i/R²
B) $\mu$ ₀i/2 $\pi$ R
C) $\mu$ ₀i/4 $\pi$ R
D) $\mu$ ₀i/2R
E) $\mu$ ₀i/4R