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A metal rod of mass m can rotate about a horizontal axis O sliding along...

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A metal rod of mass m can rotate about a horizontal axis O sliding along a circular conductor of radius a Fig The arrangement is located in a uniform magnetic field of induction B directed perpendicular to the ring plane The axis and the ring are connected to an emf source to form a circuit of resistance R Neglecting the friction circuit inductance and ring resistance find the law according to which the source emf must vary to make the rod rotate with a constant angular velocity w

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