59. Two long, straight wires are separated by 0.120 m. The wires carry currents of 8.0 A in opposite directions, as the drawing indicates. Find the magnitude of the net magnetic field at the points labeled (a) A and (b) B.

 

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The magnetic field lines are circles around each wire.  The direction of the field lines are determined by right hand rule. Wire on the left has magnetic field lines pointing up at point A and down at point B.  The wire on the right has magnetic field lines pointing down at both points A and B.

 

Magnetic field due to a long straight wire is found from

 

 

At point A,

 

 

 

 

At point B,

 

 

 

 

 

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This page last updated on June 21, 2018