일반물리학 2 — Magnetic Fields Due to Currents: Problem 2

2 Figure 29-25a shows a length of wire carrying a current i and bent into a circular coil of one turn. In Fig. 29-25b the same length of wire has been bent to give a coil of two turns, each of half the original radius. (a) If \(B_a\) and \(B_b\) are the magnitudes of the magnetic fields at the centers of the two coils, what is the ratio \(B_b/B_a\)? (b) What is the ratio \(\mu_b/\mu_a\) of the dipole moment magnitudes of the coils?