Question

describing the function of galvanometers
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a galvanometer detects by showing needle movement in
if the wires in this terminals of a batt and point of wire. if the wires switched, the need needle can be alte strong

Explanation:

A galvanometer is an instrument that works based on the principle of electromagnetic induction. When an electric current passes through the coil in the galvanometer, it interacts with a magnetic field (usually provided by a permanent magnet in the device). This interaction causes a torque on the coil, which is connected to a needle. The torque makes the needle move. The amount of movement of the needle is proportional to the magnitude of the electric current. So, the fundamental function of a galvanometer is to detect the presence and measure the magnitude of an electric current by showing needle movement.

Answer:

an electric current