A stream of electrons is traveling through a wire from the bottom of the screen to the top of the screen. The magnetic field runs into the screen. In which direction is the force on the wire?
A. To the left of the screen
B. To the right of the screen
C. Into the screen
D. Out of the screen
B
The force on a wire is given by:
Since electrons are traveling from the bottom of the screen to the top, the current is flowing from the top of the screen to the bottom. The right hand rule then gives the direction of the force to be toward the right of the screen.
