The cross section of a copper strip is 1.2 mm thick and 25 mm wide. There is a 10-A current through this cross section, with the charge carriers traveling down the length of the strip. The strip is placed in a uniform magnetic field that has a magnitude of 4.0 T and is directed perpendicular to both the length and the width of the strip. The number density of free electrons in copper is 8.47 ×10^19 mm^(−3).

a) Calculate the speed of the electrons in the strip.

Express your answer with the appropriate units. v = ?

b) Calculate the potential difference across the strip width.

Express your answer with the appropriate units. Delta V = ?