Question

In a potentiometer of ten wires, the balance point is obtained on sixth wire. To shift the balance
point to eight wire, we should
a)Increase the resistance in the primary circuit
b) Decrease the resistance in the primary circuit
c) Decrease resistance in series with the cell whose emf has to be measured
d) Increase resistance in series with the cell whose emf has to be measured

Answer 1

Answer:

we can identify that I is inversely proportional to R and so the potential difference of the wire decreases therefore it requires more length to measure the e.m.f of secondary cell. So, therefore by increasing the resistance in the series circuit we can move the balancing point from sixth to eight wire.