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A portion is fired from origin with velo...

A portion is fired from origin with velocity `vec(v) = v_(0) hat(j)+ v_(0) hat(k)` in a uniform magnetic field `vec(B) = B_(0) hat(j)`. In the subsequent motion of the proton

A

its Z co-ordinate can never be negative

B

its x co-ordinate can never be positive

C

its x and z co-ordinates cannot be zero at the same time

D

its y co-ordinate will be proportional to its time of flight

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The correct Answer is:
b,d
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Knowledge Check

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    D
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