HW _10 P2213 F09

# HW _10 P2213 F09 - Physics 2213 Homework#10 Fall 2009 Due...

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1 Physics 2213 Homework #10 Fall 2009 Due : the last recitation class of the week of November 9-13. If it happens to be Wednesday, you can hand this homework in later of the week. Because of Prelim 2, there is no quiz this week. Read: Chapter 27, in particular Sec. 27.8 on DC motor, which we did not have time to discuss in class. Exercises and Problems (8 problems, to be handed in) : (1) [Magnetic Force on an Electron ] An electron moves with speed 5.0 x 10 5 m/s in a uniform magnetic field of 0.60 T that points East. At some instant, the magnetic force on the electron is 4.0 x 10 -14 N upward. (a) In what direction is the electron moving at that instant? [If there's more than one possible direction, give all the possibilities.] On a carefully drawn and labeled diagram, show the (possible) direction(s) of the electron's velocity relative to the magnetic field and force. (b) What's the greatest force that this magnetic field could produce on an electron moving at this speed? Show the direction of that electron's velocity relative to the field. (2)

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## This note was uploaded on 12/25/2009 for the course PHYS 213 at Cornell.

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HW _10 P2213 F09 - Physics 2213 Homework#10 Fall 2009 Due...

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