What is the principle of moving coil galvanometer?
A moving coil galvanometer works on the principle that a current-carrying coil placed in a magnetic field, experiences a torque. The coil springs along with the radial field ensure the deflection to be proportional to the strength of the current.
What is the principle of moving coil galvanometer with the help of diagram explain its working?
The working of a moving coil galvanometer is based on the fact that when a current carrying coil is placed in a magnetic field, it experiences a torque. Working: Suppose that a coil PQRS is suspended freely in a magnetic field. Let B = strength of the magnetic field in which the coil is suspended.
What is galvanometer and its principle?
A galvanometer works by deflecting a pointer in response to an electric current flowing through a coil in a constant magnetic field. Galvanometers can be thought of as a kind of actuator.
What is the basic principle of a moving coil galvanometer Class 12?
Hence the principle on which a moving coil galvanometer works can be stated as to when a current-carrying coil which is suspended freely in a magnetic field a torque acts upon the coil and due to this torque the coil rotates and the deflection of the coil is directly proportional to the current flowing through the coil …
What is the working principle of galvanometer how can be a galvanometer converted in an ammeter?
A galvanometer is converted into an ammeter by connecting a low resistance in parallel with the galvanometer. This low resistance is called shunt resistance S. The scale is now calibrated in ampere and the range of ammeter depends on the values of the shunt resistance.
What is the working principle of galvanometer Class 12?
What is a moving coil galvanometer explain its sensitivity in terms of current and voltage?
The sensitivity of a Moving Coil Galvanometer is the ratio of the change in deflection of the galvanometer to the change in current. Therefore we write, Sensitivity = dθ/di. If a galvanometer gives a larger deflection for a small current it is a sensitive galvanometer.
What is moving coil galvanometer 12?
Moving coil galvanometer is an electromagnetic device that can measure small values of current. It works on the principle that when a current loop is placed in an external magnetic field, it experiences torque, and the value of torque can be changed by changing the current in the loop.
What is the principle behind galvanometer?
a coil carrying current experiences a torque in magnetic field.
What is Lenz law in physics?
Lenz’s law, in electromagnetism, statement that an induced electric current flows in a direction such that the current opposes the change that induced it. This law was deduced in 1834 by the Russian physicist Heinrich Friedrich Emil Lenz (1804–65).
Why mirror is used in moving coil galvanometer?
The mirror attached to the coil frame rotates together with it. This form of instrument can be more sensitive and accurate and it replaced the Kelvin’s galvanometer in most applications. The moving coil galvanometer is practically immune to ambient magnetic fields.
What is the working principle of moving coil loudspeaker?
The moving coil loudspeaker uses the magnetic effect generated by a flowing current as the basis of its operation. When a current flows in a wire, a magnetic field appears around it. When the wire is wound into a coil, the effect is increased.
What is the principle of a moving coil galvanometer?
The Principle of moving coil galvanometer is, that a current carrying coil placed in a magnetic field experiences a torque. insulated copper wire wound over a light metallic frame. coil is suspended between the pole pieces of a horse-shoe magnet by a fine phosphor – bronze strip from a movable torsion head.
How is the deflection of a galvanometer measured?
In a suspended coil galvanometer, the coil is suspended by a thin phosphor bronze strip and the deflection of the coil is measured by a lamp and a scale arrangement. A suspended coil galvanometer can measure currents of the order of 10 -9 A.
What happens if you hit the stop pin on a galvanometer?
If somehow a heavy current happens to flow into the coil of the galvanometer, then due to very large deflection the pointer of the galvanometer may strike the ‘stop pin’ and be broken, or coil of the galvanometer may burn due to excessive heat produced.
How is electric current passed through a galvanometer?
In order to pass electric current through the galvanometer, the suspension strip W and the spring S are connected to terminals. Consider a single turn of the rectangular coil PQRS whose length be l and breadth b. PQ = RS = l and QR = SP = b. Let I be the electric current flowing through the rectangular coil PQRS as shown in Figure 3.67.