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# If an electron and a proton having same momentums enter perpendicularly to a magnetic field, then

$\begin {array} {1 1} (a)\;\text{curved path of electron and proton will be same} \\ (b)\;\text{they will move undeflected} \\ (c)\;\text{curved path of electron is more curved than that of proton}\\ (d)\;\text{path of proton is more curved} \end {array}$

Since momentums are same and masses of electron and proton are different, so they will attain different velocities and hence experience different forces. But radius of circular path is depending on momentum so both will be moving on same trajectory (curved path).
Ans : (a)