[单选题]
X, Y and Z are three plane coils. They are
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Both coils X and Z are moved to the right. What are the directions of the induced currents in coil X and coil Z relative to coil Y?
A. Coil X is Same direction as in coil Y ; Coil Z is Same direction as in coil Y
B. Coil X is Opposite direction to coil Y ; Coil Z is Same direction as in coil Y
C. Coil X is Same direction as in coil Y ; Coil Z is Opposite direction to coil Y
D. Coil X is Opposite direction to coil Y ; Coil Z is Opposite direction to coil Y
参考答案:
B
本题详细解析:
Explanation:According to Lenz' law, emf is induced such that the induced current is a direction to oppose the change in flux. Coil X is approaching coil Y, and magnetic flux increases; the induced current will be in the opposite direction to create the opposing magnetic field. Conversely, coil Z recedes from coil Y, and magnetic flux decreases; that is, the induced current will be in the same direction to create a magnetic field in the same direction.
