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## Class 12 Physics (India)

### Course: Class 12 Physics (India)>Unit 3

Lesson 11: Wheatstone bridge

# Wheatstone bridge: concept and application

## Problem

Consider the following circuit of three known resistors, R, start subscript, 1, end subscript, R, start subscript, 3, end subscript, and R, start subscript, 4, end subscript, an unknown resistor R, start subscript, 2, end subscript, and a galvanometer connected between the points start text, B, end text and start text, C, end text.
The circuit is connected to a cell of unknown voltage.
If the current in the galvanometer, I, start subscript, start text, G, end text, end subscript, equals, 0, what is the resistance, R, start subscript, 2, end subscript?
R, start subscript, 2, end subscript, equals
\Omega
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