A proton and an 
-particle are simultaneously projected in opposite direction into a region of uniform magnetic field of 
perpendicular to the direction of the field. After some time it is found that the velocity of proton has changed in direction by 
. Then at this time, the angle between the velocity vectors of proton and 
-particle is
Text Solution
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Given, magnetic field, 
Time-period of revolution of proton in the magnetic field 
) is given by
Time-period of revolution of 
-particle in the magnetic field 
is given by
….(ii)
Dividing Eq. (i) and (ii), we get
Hence, the time-period of 
-particle is double of the proton, i.e. if proton covers 
of angle from its starting, then 
-particle will cover 
of the angle.
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