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Question

A proton is fired from origin with velocity v=v0j+v0k in a uniform magnetic field B=B0j. In the subsequent motion of the proton:
  1. its z co-ordinate can never be negative
  2. its x co-ordinate can never be positive
  3. its x and z co-ordinates cannot be zero at the same time
  4. its 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
Solution
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