The magnetic field 41.0 cm away from a long, straight wirecarrying current 4.00 A is 1950 nT.
(a) At what distance is it 195 nT?
(b) At one instant, the two conductors in a long householdextension cord carry equal 4.00-A currents in opposite directions.The two wires are 3.00 mm apart. Find the magnetic field 41.0 cmaway from the middle of the straight cord, in the plane of the twowires.
How far is the point of interest from each wire? nT
(c) At what distance is it one-tenth as large?
cm
(d) The center wire in a coaxial cable carries current 4.00 A inone direction, and the sheath around it carries current 4.00 A inthe opposite direction. What magnetic field does the cable createat points outside the cables?
nT
