At one instant, the two conductors in a long household extension cord carry equa
ID: 3900441 • Letter: A
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?
Explanation / Answer
ccording to Ampere's law:
2*pi*r*B(r) = I*