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One long straight wire is to be held directly above another (both parallel to the ground...

One long straight wire is to be held directly above another (both parallel to the ground and to each other) by repulsion between their currents. The lower wire carries 190 A and the wire 8.50 cm above it is 13-gauge (1.829 mm diameter) copper wire. (The density of copper is 8.80 ✕ 103 kg/m3.)

(a) What current (in A) must flow in the upper wire, neglecting the Earth's field?

(b) What is the smallest current (in A) if the Earth's 3.00 ✕ 10−5 T field is parallel to the ground and is not neglected?

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