In this Physics video lecture in Hindi for class 12 we explained the construction and working principle of a moving coil galvanometer and die the derivation of current sensitivity and voltage sensitivity of a moving coil galvanometer. We also talked about the factors affecting the sensitivity of a galvanometer. A galvanometer is an electrical instrument which can detect a very small current. We know that a current carrying coil rotates in a magnetic field, because it experiences a torque. The moving coil galvanometer works on this principle. As it is attached with a spring, this spring applies a restoring torque when the coil rotates. When the magnitude of both the torques are the same, the coil experiences a rotational equilibrium. A needle is attached to the coil and hence it also deflects. The deflection (measured in radian) is the product of the number of turns in the coil, the current, the area of the coil and the magnitude of the magnetic field divided by the torsional rigidity of the spring. Torsional rigidity is torque per unit twist.
Proper calibration can give us the exact amount of current flowing through the coil of the galvanometer. The created magnetic field is a radial magnetic field.
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Arijit Daripa
EduPoint,
Dam Road,
Chandil,
Dist- Seraikela-Kharsawan,
Jharkhand,
India.
Негізгі бет Ғылым және технология 🔴 MOVING COIL GALVANOMETER || in HINDI
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