A particle of charge -q and mass m enter...

A particle of charge -q and mass m enters a uniform magnetic field `vecB` (perpendicular to paper inward) at P with a velocity `v_0` at an angle `alpha` and leaves the field at Q with velocity v at angle `beta` as shown in fig.

`alpha=beta`

`v-v_(0)`

`PQ=(2mv_(0)sinalpha)/(Bq)`

particle remains in the field for time `t=(2m(pi-alpha))/(Bq)`

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