試題詳解

55. The coil shown below has 2 turns, a cross-sectional area of 0.20 m² , and a field (parallel to the axis of the coil) with a magnitude given by B = (4.0 + 3.0t ² ) T, where t is in s. What is the potential difference, V_A - V_C, at t = 3.0 s?
(A) -7.2 V
(B) +7.2 V
(C) -4.8 V
(D) +4.8V
(E) -12 V