SAT Subject Physics Practice Question 309: Answer and Explanation
5. The diagram below shows atomic particles moving through a magnetic field.
A beam of electrons is deflected in the magnetic field shown. The electrons that have passed through the field strike the screen at point P.
At which letter would a stream of electrons strike the screen if the poles of the magnet were reversed?
Correct Answer: E
The correct answer is (E). When the field is reversed, the electron is deflected in the opposite direction with the same magnitude.