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In a region of space, a uniform magnetic...

In a region of space, a uniform magnetic field B exists in the y direction. A proton 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,

A

Its x coordinate can never be positive

B

Its x and z coordinates cannot both be zero at the same time

C

Its z coordinate can never be negative

D

Its y coordinate will be proportional to the square of its time of flight

Text Solution

Verified by Experts

The correct Answer is:
A
Path will be helix with axis `x=-R=-(mv sin alpha)/(qB)`
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