ch28-p072 - 72. (a) Equating the magnitude of the electric...

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72. (a) Equating the magnitude of the electric force ( F e = eE ) with that of the magnetic force (Eq. 28-3), we obtain B = E / v sin φ . The field is smallest when the sin factor is at its largest value; that is, when = 90°. Now, we use Km v = 1 2 2 to find the speed: v K m e == ×× × 2 2 2 5 10 160 10 911 10 296 10 31 9 31 7 .. . eV J eV kg ms c hc h Thus, B E v × × 10 10 34 10 3 7 4 Vm T. . . The direction of the magnetic field must be perpendicular to both the electric field (
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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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