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  4. 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

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Q. 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

Current Electricity

Solution:

If length is kept same, potential gradient remains same, so null point does not change.