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A 1.0-m lamp cord leads from the 110-V outlet to a lamp having a 75-W lightbulb....

A 1.0-m lamp cord leads from the 110-V outlet to a lamp having a 75-W lightbulb. The cord consists of two insulated parallel wires 4.0 mm apart and held together by the insulation. One wire carries the current into the bulb, and the other carries it out.

(a) What is the magnitude of the magnetic field the cord produces midway between the two wires? (Express your answer to two significant figures.)

(b) What is the magnitude of the magnetic field the cord produces 1.0 mm from one of the wires in the same plane in which the two wires lie? (Express your answer to two significant figures.)

(c) Compare the field between 1.0 mm from one of the wires in the same plane in which the two wires lie with Earth’s magnetic field? (Express your answer to two significant figures.)

(d) What magnetic force do the two wires exert on one another? (Express your answer to two significant figures.)

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