A 10 M Long Potentiometer Wire Is Connected To A Battery Having A Steady Voltage. A Leclanche Cell Is Balanced At 4 M Length Of The Wire. If The Length Is Kept The Same, But Its Cross-Section Is Doubled, The Null Point Will Be Obtained At:

Sol:

If the length of the potentiometer is identical, the null point will be obtained at some point because the potential gradient will not change.

Potential gradient = V/L

Where:

V=Voltage across potentiometer

L=length of potentiometer wire

Therefore, the null point will not change and will be obtained at 4m.

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