An electron and a proton each travel with equal speeds around circular orbits in the same uniform magnetic field as indicated (not to scale) in Fig. The field is into the page on the diagram. The electron travels ____ arount the _____circle.

Options

A. clockwise, smaller,couterclockwise, larger
B. couterclockwise, larger,clockwise,smaller
C. clockwise,larger,couterclockwise,smaller
D. couterclockwise,larger,clockwise,smaller

Answer

a

Explanation

`r=(mv)/(qB) implies rpropm` (for v same for both sense)