Questions

# 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.

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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.

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detailed solution

Correct option is B

When current starts flowing in a loop heat is generated in the resistance which increases the resistivity of the resistance R=ρlA .   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.