1) At one instant, a proton is moving in the positive x direction in a uniform magnetic field which is in the positive y direction. What is the direction of the magnetic force on the proton? Explain your answer.
2) A magnetic field CANNOT:
A. Exert a force on a charge
B. accelerate a charge
C. change the momentum of a charge
D. change the kinetic energy of a charge
E. Exist
3) An electron moving at 1.50 x 10^6 m/s in a direction perpendicular to a uniform magnetic field travels in a circular arc of radius 0.250 m. What is the strength of the magnetic field? (Hint: the magnetic force acts as the centripetal force for the circular motions of the electron. Review centripetal force as needed.)