ch28-p074

# Ch28-p074 - 74(a For the magnetic field to have an effect on the moving electrons we need a nonnegligible component of B to be perpendicular to

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radius of the circle is given by r = m e v / eB in agreement with Eq. 28-16. The kinetic energy of the electron is Km v e = 1 2 2 , so vK m e = 2 . Thus, r m eB K m mK eB e e e == 22 . This must be less than d , so 2 d e , or B ed e 2 . (b) If the electrons are to travel as shown in Fig. 28-57, the magnetic field must be out of the page. Then the magnetic force is toward the center of the circular path, as it must be (in order to make the circular motion possible). 74. (a) For the magnetic field to have an effect on the moving electrons, we need a non-
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## This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

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