A conductor has 3 segments; two straight and of length L each and a semicircular with radius R. It carries a current I. What is the magnetic field B at point P?
(A) \(\cfrac{\mu_0}{4\pi}\)\(\cfrac{I}{R}\)
(B) \(\cfrac{\mu_0}{4\pi}\)\(\cfrac{I}{R^2}\)
(C) \(\cfrac{\mu_0}{4}\)\(\cfrac{I}{R}\)
(D) \(\cfrac{\mu_0I}{4\pi}\)\(\)