ch28-p012

ch28-p012 - 12. (a) The force due to the electric field ( F...

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12. (a) The force due to the electric field ( Fq E = G G ) is distinguished from that associated with the magnetic field ( vB GG G ) in that the latter vanishes at the speed is zero and the former is independent of speed. The graph (Fig.28-36) shows that the force ( y - component) is negative at v = 0 (specifically, its value is –2.0 × 10 –19 N there) which (because q = e ) implies that the electric field points in the + y direction. Its magnitude is 19 net, 19 2.0 10 N 1.25 N/C 1.25 V/m || 1 .6 10 C y F E q × == = = × . (b) We are told that the x and z components of the force remain zero throughout the motion, implying that the electron continues to move along the x axis, even though magnetic forces generally cause the paths of charged particles to curve (Fig. 28-11).
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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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