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Magnetic Field between two wires

  • Thread starter SamTsui86
  • Start date
  • #1
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Homework Statement



Two parallel conductors carry currents in opposite directions, as shown in Figure P19.56. One conductor carries a current of 10.0 A. Point A is the midpoint between the wires, and point C is 5.00 cm to the right of the 10.0 A current. I is adjusted so that the magnetic field at C is zero.

p19_52.gif


Find the value of the magnetic field at A.

Homework Equations



B = (uI)/(2pi(r))

The Attempt at a Solution



I actually got the solution. I know that I have to add the field produce by the two currents together. so (uI)/(2pi(.05)) + (uI1)/(2pi(.05)) = B
But can anyone explain why I have to add them together instead of subtracting them? I figured since that current are in opposite direction I would have to subtract them. Thank You

Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
right hand rule.
 
  • #3
The magnetic fields are two parallel vectors. So combining two parallel vectors is addition. Subtraction would be necessary if the current in one wire was flowing in the opposite direction. This gave me pause too.
 

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