Electric Field Direction for Constant Velocity Proton · PhysicsBowl 2016 #24
Physics · electromagnetism
Problem
A proton moves with constant non-zero velocity in a region of space that has a uniform magnetic field directed into the plane of the page. The proton moves directly up the plane of the page. What is the direction of the electric field in this region of space? Ignore gravity.
(A) To the left
(B) To the right
(C) Down the plane of the page
(D) Up the plane of the page
(E) There is no electric field necessary