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Manipal MET2017PhysicsCurrent Electricity

A cell of emf E is connected across a resistance R . The potential difference between the terminals of the cell is found to be V . The internal resistance of the cell must be

Options

  1. AR [ E V -1 ]
  2. BR [ E V +1 ]
  3. CE R
  4. D(E-V) R

Correct answer

A. R [ E V -1 ]

Step-by-step solution

Internal resistance (r) is given by Also, aligned & r= E-V i & i= V R , we have & r= E-V V / R r=R ( E V -1 ) aligned

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