A proton and electron, each travelling with the same velocity in the +x direction enter separate regions of uniform magnetic field in the +y direction (Bp for the proton, Be for the electron). They each experience the same acceleration. Hence we know
A. The magnetic fields were in the opposite direction and have ratio Bp/Be= mp/me
B. The magnetic fields were in the opposite direction and have ratio Bp/Be= me/mp
C. The magnetic fields were identical in magnitude and direction
D. The magnetic fields were in the same direction and have ratio Bp/Be= me/mp
E. The magnetic fields were in the same direction and have ratio Bp/Be= mp/me
F. The magnetic fields were identical in magnitude and opposite in direction
A. The magnetic fields were in the opposite direction and have ratio Bp/Be= mp/me
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