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1 A long thin inextensible light thread is wound on a fixed cylinder of Ja...

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1 A long thin inextensible light thread is wound on a fixed cylinder of Ja radius r and a positively charged bead P of mass m is attached to the free end of the thread A uniform magnetic field of induction B directed along the axis of the cylinder exists in the region surrounding the cylinder as shown in the figure Initially the thread is fully wound on the cylinder and the bead touches it If the bead is projected with a velocity v radially away from the cylinder it will eventually touch the cylinder tangentially What should be the magnitude of charge on the bead to fulfil the above mentioned conditions Ars mu 2rB 20 angular 8 8 8 8p O 8 3 26 8 P 2 4

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