Hi, I have a question and I hope anyone could answer it:
How does a galvanometer use a magnetic field to indicate the strength of an electric current?
how does a galvanometer use a magnetic field to indicate the strength of an electric current
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Answer:
A moving coil galvanometer consists of a coil suspended in a uniform magnetic field B with the normal from the plane of the coil perpendicular to the magnetic field. The ends of the coil are connected to the circuit where the current is to be detected.
The torque produced in the coil deflects the coil in the direction of the magnetic field and the deflection is proportional to the torque and the torque in turn proportional to the current through the coil. In a galvanometer deflection of the coil is calibrated for different currents and the calibrated scale can be used to measure the strength of the current. A galvanometer is used for the detection of small currents only.