A long, straight wire carries a current in the +x direction, as shown. Above and

Question

A long, straight wire carries a current in the +x direction, as shown. Above and below the wire are two conducting loops, rectangular and elliptical.

(a) The current is steadily increased. What is the dircection (CW or CCW) of the induced current in each of the loops?

(b) The current is held constant while each conducting loop is pulled away from the wire with constant speed (the rectangular loop is pulled up and the elliptical loop is pulled down). What is the direction (CW or CCW) of the induced current in each of the loops?

Explanation / Answer

(a) when current increases then field also increases and so does the flux.

now in upper part field is out of plane and in lower part field is into the plane. So according to lenz law, induced current will be such that it will oppose the increasing flux. so current in rectangular is CW and in elliptical loop is CCW.

(b) the flux in both is decreasing so it is the opposite case of part (a). i.e. current in rectangular loop is CCW and in elliptical loop is CW

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