PF EMI BYU 10
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A thin light insulating rod of length l is free to rotate in a horizontal plane about a vertical axle passing through its centre. Two small balls each of mass m and charge q are affixed at the ends of the rod. This assembly is symmetrically placed between cylindrical poles N and S of an electromagnet that have established a uniform vertical magnetic field of induction Bo. The electric supply to the coils of the electromagnet is switched off. Find the angular velocity acquired by the rod long time after the magnetic field vanishes. Assume that the field was only between the poles of the magnet.
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