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
A
its y−coordinate will be proportional to its time of flight
B
its x−coordinate can never by positive
C
its x− and z−coordinate cannot be zero at the same time
D
None of the above
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Solution
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B its x−coordinate can never by positive
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