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Physics · PYQ NEET UG 2017

हिन्दी

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

  1. A
    cells.
  2. B
    potential gradients.
  3. C
    a condition of no current flow through the galvanometer.
  4. D
    a combination of cells, galvanometer and resistances.
View Answer & Solution

Correct answer · Option C

a condition of no current flow through the galvanometer.

Explanation

A potentiometer measures E.M.F. at null deflection, meaning no current is drawn from the cell, thus measuring true open-circuit voltage.

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