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Emf or potential difference from a length of wire and the potential gradient

This type of question, asked 7 times: 11 May 2023 S2, 26 Apr 2025 S1, 13 Apr 2026 S1, 13 Apr 2026 S2, 15 Apr 2026 S2, 16 Apr 2026 S1, 19 May 2026 S1. All 7 questions below, oldest first.

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  1. Question 1

    11 May 2023 S2

    30
    A battery of 6 V is connected to the ends of uniform wire 3 m long and of resistance 100 Ω100\ \Omega. The difference of potential between two points 50 cm apart on the wire is

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  2. Question 2

    26 Apr 2025 S1

    40
    The potentiometer wire is 5 m long and potential difference of 4 V is maintained between the ends. The e.m.f. of the cell which balances against a length of 200 cm of the potentiometer wire is

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  3. Question 3

    13 Apr 2026 S1

    129
    A potentiometer wire is 4 m long and potential difference of 3V is maintained between the ends. The e.m.f. of the cell which balances against a length of 100 cm of the poteniometer wire is

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  4. Question 4

    13 Apr 2026 S2

    131
    In an experiment to find emf of a cell using potentiometer, the length of null point for a cell of emf 1.51.5 V is found to be 6060 cm. If this cell is replaced by another cell of emf EE, the length of null point increases by 4040 cm. The value of EE is x/10x/10 V. The value of xx is

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  5. Question 5

    15 Apr 2026 S2

    130
    A potentiometer wire is 4m long and potential difference of 2V is maintained between the ends. The e.m.f. of the cell which balances against a length of 80 cm of the potentiometer wire is

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  6. Question 6

    16 Apr 2026 S1

    129
    A potentiometer wire is 4m long and potential difference of 3V is maintained between the ends. The e.m.f. of the cell which balances against a length of 100 cm of the potentiometer wire is

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  7. Question 7

    19 May 2026 S1

    130
    The potential gradient along the length of 1 metre wire of uniform cross section is 66 V/m. Let 'BB' and 'CC' be the two points at 4040 cm and 6060 cm marks respectively from one end. The potential difference between points B and C is

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