Question

A proton moves in a circular orbit 150 mm in radius that is perpendicular to a uniform 0.25 T magnetic field.
a. What is the speed of the proton?
b. How long does it take for the proton to move once in a circle?

c. Would the radius increase or decrease if the proton were heavier?
d. Would the radius increase or decrease if the magnetic field were larger?
e. Does the speed change if the proton were negatively charged? What about the velocity?

Answer 1