Physics Practicals Class 12

Figure of Merit of Galvanometer

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About Simulation

  • In this simulation, you will be able to understand the half-deflection method to determine the resistance of a galvanometer.
  • You will also learn about the figure of merit of galvanometer.
  • All the galvanometer experiment steps and procedures like connecting wires, noting down the readings, varying galvanometer deflections, etc., are highly interactive and have been simulated in a very similar manner as you do in a physics lab.
  • This interaction provides a very immersive virtual environment and gives you a real-lab-like experience while conducting or performing experiments.
  • It is one of the important class 12 physics practicals that you can learn in our virtual lab.

Figure of Merit of Galvanometer

Simulation Details

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


A galvanometer is a sensitive device that is used to detect very low currents. The working of a galvanometer is based on the principle that a coil placed in a uniform magnetic field experiences a torque when an electric current is set up in it. The deflection of the coil is determined by a pointer attached to it, moving on the scale. When a coil carrying current 𝐼 is placed in a radial magnetic field, the coil experiences a deflection 𝜃 which is related to 𝐼 as $$I=k \theta$$

where, 𝑘 is a constant of proportionality and is termed as a figure of merit of the galvanometer. The resistance of the galvanometer found by the half-deflection method is $$G=\frac{R S}{R-S}$$

Where, 𝑅 is the resistance connected in series with the galvanometer and 𝑆 is the shunt resistance.

The figure of merit of galvanometer is given by $$k=\frac{E}{(R+G) \theta}$$

Where, 𝐸 is the emf of the cell and 𝜃 is the deflection produced with resistance 𝑅.

Requirements for this Science Experiment

Galvanometer Battery Eliminator Resistance Box Plug Key Connecting wires

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