阿摩線上測驗
28. As shown in the figure, a wire and a 10-Ω resistor are used to form a circuit in the shape of a square,
20 cm by 20 cm. A uniform but nonsteady magnetic field is directed into the plane of the circuit. The
magnitude of the magnetic field is decreased from 1.50 T to 0.50 T in a time interval of 63 ms. The
average induced current and its direction through the resistor, in this time interval, are closest to
(A) 63 mA, from b to a.
(B)38 mA, from b to a.
(C) 63 mA, from a to b.
(D) 38 mA, from a to b.
(E) 95 mA, from a to b.
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統計： A(15), B(1), C(1), D(0), E(0) #2911326
統計： A(15), B(1), C(1), D(0), E(0) #2911326
