Question

A scientist measuring the resistivity of a new metal alloy left her ammeter in another lab, but she does have a magnetic field probe. So she creates a 7.5-m-long, 4.0-mm-diameter wire of the material, connects it to a 1.5 V battery, and measures a 5.0 mT magnetic field 1.0 mm from the surface of the wire.

Answer 1

given the

length l = 7.5 m

diameter d = 4.0 mm

Batter V = 1.5 V

B= 5.0mT and magnetic field =1.0 mm