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A particle of mass m and positive charge...

A particle of mass m and positive charge q, moving with a uniform velocity v, enters a magnetic field B as shown in Find The radius of the circular are it describes in the magnetic field. (b) find the angle subtended by the arc at the centre. (c ) How long does the particule stay inside the magnetic field? (d) Solve the three parts of the above problem if the charge q on the particle is negative.

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