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

question 349

Multiple Choice

As shown in the figure, a metal bar is in contact with a pair of metal parallel rails. A steady uniform magnetic field $B$ , perpendicular to the plane of the rails and pointing outward from the page, is present. The bar is in downward motion with velocity of magnitude $v$ . 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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