Two infinite parallel wires, a distane of 2x apart, each have a current I flowing in...
Two infinite parallel wires, a distane of 2x apart, each have a current I flowing in opposite directions. Now imagine placing a circular ring of wire with a current of 4I, centered at the midpoint m.
a) What is the radius of this ring so the magnetic field at m is 0?
b) Does the current flow clockwise or counter clockwise.
Homework Answers
1) Magnetic field is zero,
2*u0i/2pix - u0*4i/2r = 0
1/pix = 2/r
r = 2x/pi
b) current should be in counterclockwise direction, i.e. portion near to straight wires should have opposite current.
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