Galvanometer
Galvanometer is the
moving coil electric current detector or simply coil
electric current detector. There are normally a lot of
turns in the coil to increase its sensitivity. When we
pass current through a coil in a magnetic field, the
coil faces a torque proportional to the current. This
movement of coil is opposed by the spring.
The Coil is put in such a
way in the magnetic field that the lines come parallel
to the plane of wire on it turns. The materials required
to make a Galvanometer are listed below. The moving coil
is suspended from a spring which winds up on coil
rotation producing up a restoring torque proportional to
the winding up of the spring. The coil comes to
equilibrium state when this restoring torque balances
the torque because of magnetic field and balances the
torque due to the magnetic field.
Materials Required for Galvanometer:
about 8 feet of insulated wire (18-24 gauge)
metal sewing needle
3 feet of thread
permanent magnet
6 volt battery
a small strip of paper
scissors
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