Question

when galvanometer detects no current​

Answer 1

As electric current will flow in path with zero resistance when a zero resistance path and finite resistance path are in parallel combinations. In a Wheatstone bridge, the resistors have a finite resistance and the resistance of the galvanometer can be considered as either negligible or finite.

Answer 2

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Galvanometer, instrument for measuring a small electrical current or a function of the current by deflection of a moving coil. The deflection is a mechanical rotation derived from forces resulting from the current.

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