Answer to Question #24553 in Electric Circuits for Jocelyne

Question

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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 1.1×10^29 m^-3. The current in the solution is carried equally by positive and negative ions with charges +/- 2e, the density of each ion species is 6.4×10^23 m^-3 . The electron density in the beam is 2.1×10^16 m^-3.

a) Find the drift speed in the salt solution. Express your answer using two significant figures in mm/s.
b) Find the drift speed in the electron beam. Express your answer using two significant figures in mm/s.