Physics Practicals Class 12

Meter Bridge – Resistance of a Wire

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About Simulation

  • In this simulation, you will correlate the principle of Wheatstone bridge with the meter bridge experiment for physics practical class 12.
  • You will learn the theory behind Wheatstone’s meter bridge and examine the resistance of a wire.
  • You will determine the resistivity (specific resistance) of a given material of the wire.
  • All the experiment steps and procedures, such as connecting the wire, measuring the balancing lengths, observing the null deflection of the galvanometer, etc., are highly interactive and have been precisely recreated in a manner that is very similar to what you would do in a real lab.

Meter bridge

  • This interaction provides a very immersive virtual reality environment and gives you a real-lab-like experience while conducting or performing experiments.

Simulation Details

Duration – 30 Minutes
Easily Accessible
Language – English
Platforms – Android & Windows


The meter bridge, also known as the slide wire bridge consists of a 1-meter-long wire of uniform cross-sectional area, fixed on a wooden block. A scale is attached to the block. Two gaps are formed on it by using thick metal strips in order to make the Wheatstone bridge.

The meter bridge operates using the Wheatstone principle. Here, four resistors P, Q, R, and S are connected to form the network ABCD. Terminals A and C are connected to a battery, and the terminals B and D are connected to a galvanometer.

Meter Bridge Principle

In the balancing condition, there is no deflection on the galvanometer. Then, $$\frac{P}{Q}=\frac{R}{S}$$

If a resistance wire of unknown resistance 𝑋 is introduced in the right gap of the meter bridge and the high resistance 𝑅 is introduced in the left gap of the meter bridge, then as the jockey slides over the bridge wire, it shows zero deflection at the balancing point (null point).

If the balancing length is 𝑙, then according to the Wheatstone principle, we have $$\frac{X}{R}=\frac{l}{100-l}$$

The unknown resistance is given by $$X=R \frac{l}{100-l}$$

The specific resistance of the wire can be calculated using the relation, $$\rho=\frac{\pi r^2 X}{L}$$

where, 𝐿 is the length of the wire and 𝑟 is its radius.

Requirements for this Science Experiment

Meter Bridge Jockey Resistance Box Plug Key Battery

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