Question

Two parallel wires are each carrying 10 A and are separated by 4.0 m. If the currents are in opposite directions, what is the magnitude of the magnetic field halfway between them and which direction is it pointing?

I already worked through the first part and got an answer of 2E-6 T, but I cannot figure out how to tell the direction. A picture would be very helpful as well!

Answer 1

The magnetic field due to a stright wire is, 2T here, /t^ is the permebility of air or free space, i is the current andr is the di stance from conductor to imagined point The direction of magentic field from the right hand thumb rule,curl of fingers indicate direction of magnetic field and thumb indicates direction of current f the currents are in opposite directi on, net magnetic field hall way between them sum of magnetic field due to both wires. Net magnetic field is, net 2π 2.0m Ao 27T(2.0m) 2π 2.0m (10A+10A) 27(2.0m) 2x10-T Note currents are in the same direction .net magnetic fiel at mid point ot two conductors is the diiference between the megnetic fields of conductors