what is galvanometer?

Dear Nayan

A galvanometer is a type of ammeter: an instrument for detecting and measuring electric current.

When a current is passed through a coil in a magnetic field, the coil experiences a torque proportional to the current. If the coil's movement is opposed by a coil spring, then the amount of deflection of a needle attached to the coil may be proportional to the current passing through the coil. Such "meter movements" were at the heart of the moving coil meters such as voltmeters and ammeters

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AKASH GOYAL

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It is a device to detect direction of flow of current ..