A single rectangular turn of wire with the long sides parallel to the x axis is

Question

A single rectangular turn of wire with the long sides parallel to the x axis is near a long straight wire which is along the x axis as shown. There is a current I In the long straight wire. For each of the situations described below determine if the induced EMF in the rectangular turn of wire is CW, CCW, or zero. Explain your answers. The rectangular turn of wire is stationary, and the current in the long straight wire is increasing. The rectangular turn of wire is moving with constant velocity in the +y direction, and the current in the long straight wire is constant. The rectangular turn of wire is moving with constant velocity in the +x direction, and the current in the long straight wire is constant.

Explanation / Answer

(a)

as the current increases the magnetic field increases outwardly

so, the flux increases .the induced magnetic field opposes the increase in flux.

the induced magnetic field is inwards

the induced current is in clockwise

(b)

as the loop moves away the magnetic field decreases outwardly

so, the flux decreases .the induced magnetic field opposes the decrease in flux.

the induced magnetic field is outward

the induced current is in conterclockwise

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