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← Electric Current and Its Effects
GK QUESTION#2983

Statement I: A Wheatstone bridge is used for accurate measurement of unknown electrical resistance. Statement II: It consists of four resistors arranged in a quadrilateral form. Statement III: The bridge is balanced when the voltage across the galvanometer is maximum. Which of the following is correct?

  1. AOnly Statements I and II are correctCorrect answer
  2. BOnly Statements II and III are correct
  3. CAll three statements are correct
  4. DOnly Statement I is correct
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Answer

A. Only Statements I and II are correct

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Explanation

A Wheatstone bridge compares resistance ratios in four arms. At balance the galvanometer branch has zero potential difference and no current, rather than a maximum voltage. Statements I and II are correct.

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