Two long straight parallel conductors carrying steady currents separated by a distance’d’. Explain brifely, with the help of a suitable diagram, how the magnetic field due to one conductor acts on the other. Hence deduce the expression for the force acting between the two conductors. Mention the nature of this force.
The magnetic field, due to wire l, at any point on the wire 2, is directed normal to the direction of current flow in wire 2.
Magnetic field around wire 2, due to a current I, in wire
The nature of the force is repulsive for currents in opposite direction and attractive when currents flow in the same direction.