1.

A charged particle of charge q and mass m enters a magnetic field as shown. Find radius of the circular path and the time spent inside the field. Neglect gravity.

Answer»

`(R pi THETA)/(V)`
`(R(pi -2 theta))/(v)`
`R ((pi + 2 theta)/(v))`
`(2 R theta)/(v)`

Solution :ANGLE subtended at the centre `= pi - 2 theta` TIME spent inside the field. `t= ("arc length")/("speed")`
`=(R(pi - 2theta))/(v)`


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