First slide

Lenz's law and conservation of energy

Question

Two circular loops of equal radii are placed coaxially at some separation. The first is cut and a battery is inserted to drive a current in it. The current changes slightly because of the variation in resistance with temperature (produced due to current in the circuit). During this period, the two loops.

Easy

A

Repel each other
B

Attract each other
C

Do not exert any force on each other.
D

repel each other independent of sense of current.

Solution

When current starts flowing in a loop heat is generated in the resistance which increases the resistivity of the resistance $(R = ρ \frac{l}{A})$ . Thus the resistance of the circuit increases. This will reduce the current in that loop. Thus from lenz law the flux passing through the other loop decreases and hence a current in same direction (as in loop 1) is produced. Thus they both attract each other.

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