Same chapter3 marksDifficulty: Medium
State the principle of a potentiometer and one advantage it has over a voltmeter.
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3 marksDifficulty: Medium
State the principle of a Wheatstone bridge and the condition for balance.
Original Khojo Papers practice question — not from a past board paper.
Answer
The bridge has four resistances in a loop with a galvanometer across the middle. It is balanced when no current flows through the galvanometer, and the condition is P/Q = R/S, where P and Q are one pair of adjacent arms and R and S the other. An unknown resistance can then be found from the other three.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The metre bridge is a practical form of the Wheatstone bridge.
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