Which of the following is true regarding reciprocity theorem?

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  1. The product of response and excitation remains the same
  2. The difference between response and excitation remains the same. 
  3. The ratio of the response to the excitation remains the same
  4. The sum of response and the excitation remains the same.

Answer (Detailed Solution Below)

Option 3 : The ratio of the response to the excitation remains the same
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Reciprocity Theorem

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The reciprocity theorem states that in any linear and bilateral network or circuit having only one independent source, the ratio of response to excitation is constant even though the source is interchanged from the input terminals to output terminals.

Limitations of reciprocity theorem:

  • The reciprocity theorem is applicable only to single-source networks.
  • The reciprocity theorem is applicable only to the circuits containing independent sources.
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