8. Discuss the principle, construction and theory
of a dead beat galvanometer. State two merits
of moving coil galvanometer.
Answers
Answer:
Moving Coil Galvanometer Principle
A current-carrying coil when placed in an external magnetic field experiences magnetic torque. The angle through which the coil is deflected due to the effect of the magnetic torque is proportional to the magnitude of current in the coil.
Advantages of Moving Coil Galvanometers:
They are not affected by a strong magnetic field. They have a high torque to weight ratio. They are very accurate and reliable. Their scales are uniform.
They are not affected by a strong magnetic field. They have a high torque to weight ratio. They are very accurate and reliable. Their scales are uniform.
Dead beat galvanometer is one in which the coil comes to rest at once after the passage of current through it. The deflection can be noted in no time.
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Galvanometer:
Principle:
A galvanometer mainly works as an actuator, by making a rotary deflection of a pointer, in reply to electric current flowing through a coil in a continuous magnetic field.
Construction:
A galvanometer is constructed with a slight pivoting coil of wire, named a spindle, in the field of an everlasting magnet
Merits:
One of the merits of moving coil Galvanometer is that it is not affected by a strong magnetic field.
They are reliable and accurate.