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In a potentiometer of 10 wires, the bala...

In a potentiometer of 10 wires, the balance point is obtained on the `7^(th)`. To shift the balance point to `9^(th)` wire, we should

A

decrease resistance in the main circuit.

B

increase resistance in the main circuit.

C

decrease resistance in series the cell whose emf is to be measured.

D

increase resistance in series with the cell whose emf is to be determined

Text Solution

Verified by Experts

The correct Answer is:
D
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.
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Knowledge Check

  • In a potentiometer of 10 wires, the balance point is obtained on the 7^(th) wire. To shift the balance point to 9^(th) 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

  • In a potentiometer of 5 wires, the balance point is obtained on the 3rd wire. To shift the balance point to the 4th wire,

    A
    current of the main circuit is to be decreased.
    B
    current of the main circuit is to be increased.
    C
    the shifting is not possible
    D
    None of the above

  • In a potentiometer of ten wires each of 1m , the balance point is obtained on the sixth wire. To shift the balance point to eighth wire, we should

    A
    increases the resistance in the primary circuit
    B
    decrease the resistance in the secondary circuit
    C
    decrease the resistance in series with the cell whose emf is to be determined
    D
    increases the resistance in series with the cell whose emf's is to be determined.