Current sensitivity of a galvanometer can be increased by decreasing?

Question

Answer

Increasing Sensitivity of a Galvanometer by Decreasing

Galvanometer is a device used to measure small electric currents. It is an important instrument used in various fields of science and engineering. The sensitivity of a galvanometer is its ability to detect small changes in the current passing through it. The current sensitivity of a galvanometer can be increased by decreasing certain factors.

Factors affecting the sensitivity of a galvanometer:

Resistance of the coil

Magnetic field strength

Number of turns in the coil

Damping of the galvanometer

Decreasing the factors to increase sensitivity:

Decreasing resistance of the coil: The resistance of the coil is directly proportional to the sensitivity of the galvanometer. Therefore, decreasing the resistance of the coil can increase the sensitivity of the galvanometer. This can be done by using a coil with a smaller cross-sectional area or by using a material with a lower resistivity.

Decreasing magnetic field strength: The sensitivity of a galvanometer is inversely proportional to the magnetic field strength. Therefore, decreasing the magnetic field strength can increase the sensitivity of the galvanometer. This can be done by placing the galvanometer in a weaker magnetic field or by using a coil with fewer turns.

Decreasing number of turns in the coil: The sensitivity of a galvanometer is inversely proportional to the number of turns in the coil. Therefore, decreasing the number of turns in the coil can increase the sensitivity of the galvanometer.

Reducing damping of the galvanometer: The damping of the galvanometer is the resistance to motion of the coil. A highly damped galvanometer will not swing easily and is less sensitive. Therefore, reducing the damping of the galvanometer can increase its sensitivity. This can be done by reducing the frictional forces acting on the coil or by using a lighter coil.

Conclusion:

In conclusion, the sensitivity of a galvanometer can be increased by decreasing the resistance of the coil, magnetic field strength, number of turns in the coil, and damping of the galvanometer. By understanding these factors and taking appropriate measures, the sensitivity of a galvanometer can be increased for accurate measurements.

Answer

The deflection of a galvanometer per unit current is known as sensitivity current of galvanometer. It can be increased by increasing the value of B, N and A. It can be decreased by decreasing of value of K.

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