In the figure, a 100 mA current flows through a copper wire 0.10 mm in diameter,

Question

In the figure, a 100 mA current flows through a copper wire 0.10 mm in diameter, a 1.0-cm-diameter glass tube containing a salt solution, and a vacuum tube where the current is carried by an electron beam 1.0 mm in diameter. The density of conduction electrons in copper is 1.1×1029 m3 . The current in the solution is carried equally by positive and negative ions with charges ±2e; the density of each ion species is 6.5×1023 m3 . The electron density in the beam is 2.5×1016 m3 . Find the drift speed in the electron beam in mm/s ?

Explanation / Answer

= 0.1 /(2.5×1016 * 1.6*10-19*pi*0.0005*0.0005)

= 31830988 m/s = 3.18 x 107 m/s ANSWER

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