1.

A particle with charge +Q and mass m enters a magnetic field to magnitude B existing only of the right of the boundary YZ The direction of the motion of the particle is perpendicular to the direction of B Let T =2pi(m)/(QB) The time spent by the particle in the field will be .

Answer»

`(2 PI m)/(QB)`
`(pi m)/(QB)`
`(mv)/(QB)`
INFINITE

ANSWER :B


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