A cell of emf E is connected across an external resistance R. When current I is drawn…

Physics · Class 12 · CBSECurrent Electricity

A cell of emf E is connected across an external resistance R. When current I is drawn from the cell, the potential difference across the electrodes of the cell drops to V. The internal resistance r of the cell is

  1. \(\left(\frac{E-V}{E}\right) R\)
  2. \(\left(\frac{E-V}{R}\right)\)
  3. \(\frac{(E-V) R}{I}\)
  4. \(\left(\frac{E-V}{V}\right) R\)

Answer

(D) ( E-V V ) R

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