53. A stiff wire bent into a semicircle of radius a = 2.0 cm is rotated at constant angular speed 40 rev/s in a uniform 20 mT magnetic field. What is the amplitude of the emf induced in the loop?5ed8711e8a3b2.jpg
(A) 3.16 × 10-2 V
(B) 3.16 × 10-3 V
(C) 3.16 × 10-1 V
(D) 1.98 × 10-2 V
(E) 1.98 × 10-3 V

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統計： A(1), B(30), C(1), D(0), E(2) #2336753