As Shown in the Figure, a Metal Bar Is in Contact

question 183

Multiple Choice

As shown in the figure, a metal bar is in contact with a pair of parallel rails and is in motion with an upward velocity of magnitude ν. A uniform magnetic field is present, directed downward as shown. The direction of the induced current through the resistor R is

• A)from a to b.
• B)from b to a.
• C)No current is induced.

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