Question

Suppose a 1-m length of aluminum wire 0.001 m in diameter is held in a horizontal east-west position (in vertical equilibrium) by an external magnetic eld directed north of strength 1 G = 10-4 T. The density aluminum = 2:70 103 kg/m3 and the resistivity aluminum = 2:65 10?8 m. Also note the volume of a cylinder is Vcyl = r2h.

(f) Use Newton's second law for the wire in vertical equilibrium to nd the current Iwire that must be owing in the wire.

(g) Use your answer to parts (a) and (f) to nd the potential dierence Vwire that must exist from one end of the wire to the other.

(h) Use your answer to part (g) to nd the magnitude of the electric eld that exists within the wire from one end to the other.

(i) (2 points) Write a sentence that explains whether the electric eld is directed from-east-to-west or from-west-to-east in the wire

Answer 1