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What is the relation between the balance equation and the magnitude of input voltage?

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What is the relation between the balance equation and the magnitude of input voltage?

(a) directly proportional

(b) independent

(c) inversely proportional

(d) depends on the null indicator

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Question is taken from Advantages of Bridge Circuits in division Measurement of Resistance of Electrical Measurements

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Correct option is (b) independent

Explanation: The input voltage does not appear in the expression for the balance equation. Thus balance equation is independent of the magnitude of input voltage.

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