Question

In potentiometer, a long uniform wire is used to ______ potential gradient along the wire

Answer 1

Keep constant the potential gradient along the wire

Explanation:

• Potentiometer is the device used to calculate potential difference more accurately. It is also used to compare the E.M.F of cells and to calculate the internal resistance of any given cell. Due to great accuracy this device is used.
• Potential gradient is the ratio of Potential difference and length of the wire and this quantity is constant so we can easily calculate the required value
• The wire used must have uniform cross-section to get accurate value a jockey is rolled on the wire which is connected through a galvanometer

To know more about the potentiometer, visit :

Explain the principle of a potentiometer. Describe how will you determine (a) the ratio of emfs of two primary cells using potentiometer. (b) The internal resistance of a primary cell using potentiometer. (c) potential difference of cell using potentiometer

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Why potentiometer is named as potentiometer

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Answer 2

Potentiometer:

1.It is a device which is used  to measure the potential difference   by varying the resistances manually.

2.It is used to compare the EMF of two cells.

3.It is used to measure the internal resistance of a cell.

Potential gradient:

It is the ratio of the potential difference to the length of wire.

Potential gradient,[tex]k=\frac{V}{l}[/tex]

In potentiometer, a long uniform wire is used to lower the value  of potential gradient along the wire.