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A potentiometer wire is 100 cm long hand...

A potentiometer wire is `100 cm` long hand a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are obatined at `50 cm` and `10 cm` from the positive end of the wire in the two cases. The ratio of emfs is:

A

`5 : 4`

B

`3 : 4`

C

`3 : 2`

D

`5 : 1`

Text Solution

Verified by Experts

The correct Answer is:
C
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Knowledge Check

  • A potential wire is 100 cm lond and constant potential difference is maintained across it. Two cells are connected in series first toe support one another and this is opposite direction. The balance points are obtained at 50 cm and 10 cm from the positive end of the wire in the two cases. The ratio of emf's is :

    A
    `5:1`
    B
    `5:4`
    C
    `3:4`
    D
    `3:1`

  • A potentiometer has uniform potential gradient across it. Two cells connected in series (i) to support each other and (ii) to oppose each other are balanced over 6 m and 2 m respectively on the potentiometer wire. The e.m.f.’s of the cells are in the ratio of

    A
    `1:2`
    B
    `1:1`
    C
    `3:1`
    D
    `2:1`

  • A potentiometer wire is 500 cm long and potential difference of 4 V is maintained between the ends of the wire. The e.m.f. of the cell which balances against the length of 135 cm of the wire is

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    0.08 V
    B
    2.08 V
    C
    2.88V
    D
    1.08 V
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