As Shown in the Figure,one End of a Metal Bar

question 31

Multiple Choice

As shown in the figure,one end of a metal bar is in contact with a circular rail and the other end is pivoted at P.A steady uniform,magnetic field B into the page is present.As the bar rotates about point P in a clockwise direction,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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