Question

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

(a) The path of proton shall be more curved than that of electron. 

(b) The path of proton shall be less curved turn that of electron. 

(c) Both are equally curved. 

(d) Path of both will be straight line.

Answer 1

The correct option  (c) Both are equally curved.

Explanation:

We know r = (mV/qB)

As B is uniform, also electron and proton have same magnitude charge,

Hence r ∝ mV

mV is momentum, both have same momentum,

Hence both will have circular path with equal radius.