A copper wire of length l is bent into a semicircle. It is moved with a velocity v normal to its diameter in a region of uniform magnetic field strength B normal to the plane of the wire,then the induced EMF across the ends of wire is
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A copper wire of length l is bent into a semicircle. It is moved with a velocity v normal to its diameter in a region of uniform magnetic field strength B normal to the plane of the wire,then the induced EMF across the ends of wire is