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MHT CET2007PhysicsWave Optics

The cell has an emf of 2 ~V and the internal resistance of this cell is 0.1 , it is connected to resistance of 3.9 , the voltage across the cell will be

Options

  1. A1.95 ~V
  2. B1.5 ~V
  3. C2 ~V
  4. D1.8 ~V

Correct answer

A. 1.95 ~V

Step-by-step solution

Key Idea When cell is giving current then the potential difference across its plates is less than its emf as potential drop across internal resistance occurs. When a cell of emf E is connected to a resistance of 3.9 , then the emf E of the cell remains constant, while voltage V goes on decreasing on taking more and more current from the cell. V=E-i r where r is internal resistance. array ll Also current & i= E R+r & V=E- ( E R+r ) r array Putting the numerical values, we have aligned E=2 V, r &=0.1 , R=3.9 V &=2- (

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