Moment of inertia:
, where A is the area of the wire, vd is the drift speed.
From the law of conservation of charge, the current that enters into the 1 mm segment of the wire is equal to the current in the 2mm segment of the wire.
The two wires in the figure (Figure 1) are made of the same material.
(a) What is the current in the 2.0-mm-diameter segment of the wire?
(b) What is the electron drift speed in the 2.0-mm-diameter segment of the wire? (in μm/s)
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