Question

An electron and a proton are injected into a uniform magnetic field perpendicular to it with the same momentum. The radius of curvature is

• A. less for electron
• B. more for electron
• C. same for both
• D. none of these

Answer 1

Answer: (C)

same for both

The radius of the circular path in terms of momentum is $r=\frac{p}{qB}$

As the momentum is same for proton and electron they will have same radius.