ЁЯФм Meter Bridge Experiment
Determination of Unknown Resistance Using Wheatstone Bridge Principle
Class 11 & 12 Physics PracticalЁЯУЦ Introduction
The Meter Bridge is one of the most important experiments in Physics practical laboratories. It is used to determine an unknown resistance accurately by applying the Wheatstone Bridge Principle.
This experiment helps students understand resistance measurement, electrical circuits, bridge balancing conditions, and practical applications of resistance networks.
тЪб What is a Meter Bridge?
A Meter Bridge is a practical form of the Wheatstone Bridge used for measuring unknown resistance with high accuracy. It contains a one-meter-long uniform resistance wire stretched between two terminals.
The balance point is obtained using a jockey, where the galvanometer shows zero deflection.
ЁЯза Principle
The Meter Bridge works on the Wheatstone Bridge Principle. At balance condition, no current flows through the galvanometer.
R / X = L / (100 тИТ L)
- R = Known Resistance
- X = Unknown Resistance
- L = Balancing Length
- 100 тИТ L = Remaining Length
ЁЯУР Formula Used
This equation is used to calculate the value of the unknown resistance accurately.
ЁЯМН Applications
- Electrical Testing Laboratories
- Research and Development Centers
- Industrial Instrumentation
- Resistance Calibration Systems
- Sensor Measurements
- Electronic Circuit Testing
ЁЯОп Quick Revision
Meter Bridge = Wheatstone Bridge Principle + 100 cm Uniform Wire + Null Deflection Method