A Proton is projected with a uniform velcoity v long the axis of a current carrying solenoid, then

Options

A. the proton will be accelerated along the axis
B. the proton path will be circular about the axis .
C. the proton moves along helical path .
D. the protn will continue to move with velocity v long the axis .

Answer

d

Explanation

Force on the proton , `vecF_(B)=e(vecVxxvecB)`
Since `vecV` is parallel to `vecB`
`thereforevecF_(B)=0`
Hence proton will continue to moe with vilocity v along the axis of solenoid .