Because of a wartime shortage of copper, the electromagnets at Oak Ridge National Lab used to separate U-235 isotopes were wound with pure silver (atomic volume 10.3 cc/mole). If 100 meters of silver wire 2 mm in diameter required 8.1 watts when carrying 4 amps of current, calculate for silver the (a) resistivity, (b) mobility, (c) collision time, (d) mean free path, (e) Hall coefficient, and (f) the Hall field in a transverse magnetic field of 9 tesla. Assume silver has one free electron per atom, and a temperature of 300K. (Note: Electrical power equals the product of the current and the voltage or the product of the current squared and the resistance.)