Question

Draw the circuit diagram of a Wheatstone bridge. Obtain the condition when no current flows through the galvanometer in it.
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% Wheatstone Bridge Diagram Explanation Circuit Diagram and Condition:
The Wheatstone bridge consists of a quadrilateral circuit with four resistors, \( R_1, R_2, R_3, \) and \( R_4 \), a galvanometer \( G \), and a battery. The galvanometer is connected between the junctions of \( R_2 \) and \( R_3 \), and \( R_1 \) and \( R_4 \). The battery is connected across the bridge. % Correct answer Correct Answer: The condition for no current to flow through the galvanometer is when the bridge is balanced, given by the equation: \[ \frac{R_1}{R_2} = \frac{R_3}{R_4} \]

Hint:

The Wheatstone bridge is a fundamental tool in measuring unknown electrical resistances and is extensively used in sensors and other measuring devices.

Answer 1

This balance condition implies that the potential drop across the bridge is symmetrically distributed, resulting in zero potential difference across the galvanometer, thus no current flow.