In a region of space, a uniform magnetic field $B$ exists in the $y-$direction.Aproton is fired from the origin, with its initial velocity $v$ making a small angle $\alpha$ with the $y-$ direction in the $yz$ plane. In the subsequent motion of the proton,
  • Aits $x-$coordinate can never be positive
  • Bits $x-$ and $z-$ coordinates cannot both be zero at the same time
  • Cits $z-$ coordinate can never be negative
  • Dits $y-$ coordinate will be proportional to the square of its time of flight
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