ASSIGN4 - Section: _ Name: _ Assignment 4: Magnetic Fields...

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Section: ______ Name: ______________________________ Section Instructor: ______________________________ Physics 208, Spring 2007 1 Cornell University Assignment 4: Magnetic Fields and Forces Concepts: magnetic field magnetic force on moving charge velocity selector mass spectrometer cyclotron Hall effect magnetic force on current-carrying wire torque on current loop Reading in text: Chapter 28: Sections 1-10. Assignment: Solutions posted on Friday, February 23. Quiz may be given on or after Tuesday, March 6. 1. An electron moves with speed 50 10 5 . × m / s in a uniform magnetic field of strength 0.60 T that points East. At some instant, the electron experiences an upward magnetic force of magnitude 40 . 10 14 . × N (a) In what direction is the electron moving at that instant? [If there is more than one possible direction, describe all the possibilities.] (b) On a carefully drawn and labeled diagram, show the (possible) direction(s) of the electron’s velocity relative to the magnetic field and the force directions. (Suggestion: Draw your diagram so that the force is perpendicular to the plane of the paper.) (c) What is the greatest force that this magnetic field could possibly produce on an electron moving at this speed? Show the orientation of that electron’s velocity relative to the field. 2. A velocity selector uses crossed electric and magnetic fields to allow only charged particles with a specific speed to pass through without being deflected.
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This note was uploaded on 03/10/2008 for the course PHYS 2208 taught by Professor Fulbright, r during the Spring '07 term at Cornell.

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ASSIGN4 - Section: _ Name: _ Assignment 4: Magnetic Fields...

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