Q35:The magnetic field cm away from a long, straight wire carrying current A is mT.
(a) At what dis- tance is it mT?
(b) What If? At one instant, the two conductors in a long household extension cord carry equal -A currents in opposite directions. The two wires are mm apart. Find the magnetic field cm away from the middle of the straight cord, in the plane of the two wires.
(c) At what distance is it one-tenth as large?
(d) The center wire in a coaxial cable carries current A in one direction, and the sheath around it carries current A in the opposite direction. What magnetic field does the cable create at points outside the cable?
pi =
g =
u =