A thin circular ring of mass m radius R has a uniformly distributed charge Q...

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A thin circular ring of mass m radius R has a uniformly distributed charge Q The ring is placed on a rough horizontal floor The coefficient of friction between the ring and the floor is u A uniform vertically upward magnetic field of radius greater than R and co axial with the ring exists in the space The magnetic field is changing as B Bot tesla where t is the time in second where Bo is a positive constant Now answer the following questions based on the above paragraph b umg Find the Time at which the Ring Starts Rotating 4 Mmg 3B QR BQR M

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