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Reciprocity Theorem is used to find the change in _______ when the resistance is changed in the circuit.

(a) Voltage

(b) Voltage or current

(c) Current

(d) Power

The question was posed to me in an interview for internship.

This intriguing question originated from Compensation Theorem in section Useful Theorems in Circuit Analysis of Network Theory

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Correct choice is (b) Voltage or current

Explanation: Reciprocity Theorem is used to find the change in voltage or current when the resistance is changed in the circuit. If reciprocity theorem is satisfied the ratio of response to excitation is same for the two conditions.

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