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

question 121

Multiple Choice

As shown in the figure, a metal bar is in contact with a pair of parallel rails. A steady, uniform, magnetic field B is present directed to the right. The bar is moving upward with velocity of magnitude ν. What is the polarity of the induced emf in terminals X and Y?

• A) X and Y are at the same potential.
• B) X is positive and Y is negative.
• C) Y is positive and X is negative.

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