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# A proton is fired from origin with velocity →v=v0→j+v0→k in a uniform magnetic field →B=B0→j. In the subsequent motion of the proton:its z co-ordinate can never be negativeits x co-ordinate can never be positiveits x and z co-ordinates cannot be zero at the same timeits y co-ordinate will be proportional to its time of flight

A
its y co-ordinate will be proportional to its time of flight
B
its z co-ordinate can never be negative
C
its x co-ordinate can never be positive
D
its x and z co-ordinates cannot be zero at the same time
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