An aluminum wire having a cross-sectional area equal to 5.30 10-6 m2 carries a current of 7.00 A. The density of aluminum is 2.70 g/cm3. Assume each aluminum atom supplies one conduction electron per atom. Find the drift speed of the electrons in the wire.
In the Bohr model of the hydrogen atom, an electron in the 5th excited state moves at a speed of 8.76 x 104 m/s in a circular path of radius 1.32 x 10-9 m. What is the effective current associated with this orbiting electron?