The magnetic field 43.0 cm away from a long, straight wire carrying current 3.00 A is 1400 nt. (a) At what distance is it 140 nT? x cm (b) At one instant, the two conductors in a long household extension cord carry equal 3.00-A currents in opposite directions. The two wires are 3.00 mm apart. Find the magnetic field 43.0 cm away from the middle of the straight cord, in the plane of the two wires. XnT (c) At what distance is it one-tenth as large? Хcm (d) The center wire in a coaxial cable carries current 3.00 A in one direction, and the sheath around it carries current 3.00 A in the opposite direction. What magnetic field does the cable create at points outside the cables? nT
a) 0.857 cm, 0 nT, 8.57 cm, 0 nT
b) 8.57 cm, 0 nT, 85.7 cm, 0 nT
c) 8.57 cm, 0 nT, 85.7 cm, 0 nT
d) 0.857 cm, 0 nT, 430 cm, 0 nT