What is the difference between galvanometer and ballistic galvanometer?

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Solution

Galvanometer Ballistic Galvanometer
It is an electrical device that can be used to detect current flowing through it. Calibrated galvanometers can also be used to measure the current.
The moving part (coil) is typically light and has a low moment of inertia.
It is an electrical device that can be used to detect and measure the quantity of electric charge discharging through it.
The moment of inertia of the moving part is larger than the normal current detecting galvanometer.

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Galvanometer	Ballistic Galvanometer
It is an electrical device that can be used to detect current flowing through it. Calibrated galvanometers can also be used to measure the current. The moving part (coil) is typically light and has a low moment of inertia.	It is an electrical device that can be used to detect and measure the quantity of electric charge discharging through it. The moment of inertia of the moving part is larger than the normal current detecting galvanometer.