A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F. because the method involves :

 

  • Option 1)

    cells

  • Option 2)

    potential gradients

  • Option 3)

    a condition of no current flow through the galvanometer

  • Option 4)

    a combination of cells, galvanometer and resistances

 

Answers (1)

As we discussed in

Potentiometer -

It is a device used to measure e.m.f of a given cell and to compare e.m.f's of cells

- wherein

It is also used to measure internal resistance of given cell

 

 None

Because the method involves a condition of no current flow through the galvanometer the device can be used to measure P.D internal resistance of a cell and compare emf's of two sources


Option 1)

cells

This option is incorrect

Option 2)

potential gradients

This option is incorrect

Option 3)

a condition of no current flow through the galvanometer

This option is correct

Option 4)

a combination of cells, galvanometer and resistances

This option is incorrect

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