At one instant, the two conductors in a long household extension cord carry equa

Question

At one instant, the two conductors in a long household extension cord carry equal 2.03 A currents in opposite directions. The two wires are a=3.08 mm apart. Calculate the magnitude of the magnetic field d = 39.2 cm away from the middle of the two cords (as in figure), in the plane of the two wires.

At what distance is it one-tenth as large?

The center wire in a coaxial cable carries current 2.03 A in one direction, and the sheath around it carries current 2.03 A in the opposite direction. What magnetic field does the cable create at points outside?

Explanation / Answer

ccording to Ampere's law:
2*pi*r*B(r) = I*

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