Question
Question: In a potentiometer of 10 wires, the balance point is obtained on the 7<sup>th</sup> wire. To shift t...
In a potentiometer of 10 wires, the balance point is obtained on the 7th wire. To shift the balance point to 9th wire, we should
A
Decrease resistance in the main circuit.
B
Increase resistance in the main circuit.
C
Decrease resistance in series with the cell whose emf is to be measured.
D
Increase resistance in series with the cell whose emf is to be determined.
Answer
Increase resistance in series with the cell whose emf is to be determined.
Explanation
Solution
: To shift the balance point on higher length, the potential gradient of the wire is to be decreased. The same can be obtained by decreasing the current of the main circuit, which is possible by increasing the resistance in series of potentiometer wire.