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Q.

In a potentiometer of 10 wires, the balance point is obtained on the 6th wire. To shift the balance point to 8th wire, we should

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a

Increase resistance in the main circuit

b

Decrease resistance in the main circuit 

c

Increase resistance in series with the cell whose emf is to be measured 

d

Decrease resistance in series with the cell whose emf is to be measured 

answer is A.

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Detailed Solution

To shift the balance point to 8th wire from 6th wire means to increase the resistance that is to be balanced. Therefore we increase resistance in the main circuit.

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