Length of potentiometer wire=100cm
Total resistance of wire(r)=10
Resistance of 40 cm wire(r1)=4Ω
EMF of driver cell(E)=
External resistance of circuit(R)=R
Current(I) in the circuit is given by = A
Voltage drop across 40 cm potentiometer wire= =
=
This voltage drop is equal to the balancing EMF of or or
so,
It is the right answer.
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