Physics-
General
Easy

Question

In the figure, potential difference between A and B is

  1. Zero    
  2. 5 V    
  3. 10 V    
  4. 15 V    

The correct answer is: 10 V


    Here p minus n junction is forward biased. If p minus n junction ideal, its resistance is zero. The effective resistance across A and B
    equals fraction numerator 10 cross times 10 over denominator 10 plus 10 end fraction equals 5 k capital omega.
    Current in the circuit I equals fraction numerator V over denominator R end fraction equals fraction numerator 30 over denominator 15 cross times 10 to the power of 3 end exponent end fraction equals fraction numerator 2 over denominator 10 to the power of 3 end exponent end fraction A
    Current in arm A B equals I equals fraction numerator 2 over denominator 10 to the power of 3 end exponent end fraction
    Potential difference across A and B equals fraction numerator 2 over denominator 10 to the power of 3 end exponent end fraction cross times 5 cross times 10 to the power of 3 end exponent equals 10 blank V.

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