An electron and a proton with equal momentum enter perpendicularly into a uniform magnetic field, then

Options

A. path of both will be straight line
B. both are equally curved
C. the path of proton shall be less curved than that of electron
D. the path of proton shall be less curved than that of electron

Answer

B

Explanation

The radius of circular path traced by electron and proton is given by
`r=(mv)/(qB)=(p)/(qB)=sqrt(2mKE)/(qB)`
`therefore r prop v prop p prop sqrt(k)`
As both proton and electron have same momentum hence both will have the same circular path i.e both are equally curved