29. By what factor is the drift velocity in a conductor changed if the voltage is doubled? (A)1(B)2(C) 3 (D) 1/2(E) 1/4.

29. By what factor is the drift velocity in a conductor changed if the voltage is doubled?
(A)1
(B)2
(C) 3
(D) 1/2
(E) 1/4.

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統計： A(0), B(21), C(0), D(2), E(0) #3093870

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36. A 30 turn square coil (length of side = 12 cm ) with a total resistance of 2.5 Ω is placed in a uniform magnetic field directed perpendicularly to the plane of the coil. The magnitude of the field varies with time according to B= Ae8t, where A = 50 mT and t is measured in seconds. What is the magnitude in V of the induced emfin the coil at t = 0? (A) 0.31 (B) 0.27 (C) 0.17 (D) 0.20 (E) 22 x 10-3.

29. By what factor is the drift velocity in a conductor changed if the voltage is doubled?
(A)1
(B)2
(C) 3
(D) 1/2
(E) 1/4.

詳解 (共 1 筆)

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