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There is a potentiometer wire of length ...

There is a potentiometer wire of length 1200 cm and 60 mA current is flowing in it. A battery of emf 5V and internal resistance of `20 ohm` is balanced on potentiometer wire with balancing length 1000 cm. The resistance of potentiometer wire is

A

`80 ohm`

B

`100 ohm`

C

`120 ohm`

D

`60 ohm`

Text Solution

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The correct Answer is:
B
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Knowledge Check

  • The length of the potentiometer wire is 600 cm and a current of 40 mA is flowing in it. When a cell of emf 2 V and internal resistance 10Omega is balanced on this potentiometer the balance length is found to be 500 cm. The resistance of potentiometer wire will be

    A
    `20Omega`
    B
    `40 Omega`
    C
    `60Omega`
    D
    `80Omega`

  • The potentiometer wire is of length 1200 cam and it carries a current of 60 mA. For a cell of emf 5V and internal resistance of 20Omega , the null point of it is found to be at 1000 cm.The resistance of potentiometer wire is

    A
    `60Omega`
    B
    `120 Omega`
    C
    `100 Omega`
    D
    `80 Omega`

  • A battery of emf 26V and internal resistance 0.4 ohm is connected to a resistance of 10ohm and a potentiometer wire of length 10m. What is the potential gradient on the wire if the resistance of the potentiometer wire is 5 ohm –

    A
    `2.60 V//m`
    B
    ` 0.250 V//m`
    C
    ` 0.844 V//m`
    D
    ` 0.422 V//m`

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