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5. What is a moving coil galvanometer? and suspended coil galvanometer

# What is a moving coil galvanometer? and suspended coil galvanometer

moving coil galvanometer in hindi: what is moving coil galvanometer, moving coil galvanometer With the help of this, the presence and direction of current in the circuit can be detected.

### type of galvanometer

There are two types of galvanometers.

1. floating magnet galvanometer
2. moving coil galvanometer

There are also two types of moving coil galvanometers.

1. riveted coil galvanometer
2. suspended coil galvanometer

## what is moving coil galvanometer

Friends, I have told you what is the current horoscope, but in another definition, let us also know what it is.

The presence and direction of current in an electric circuit can be detected by the use of a mobile coil galvanometer.

## suspended coil galvanometer

We have learned what is a floating coil galvanometer, so now let us know what is a suspended coil galvanometer.

When a current is passed through a coil placed between a uniform magnet or magnetic field, a pair of forces is produced on it. so to this suspended coil galvanometer it is said.

### Structure of suspended coil galvanometer

A magnetic material has a core like aluminum has a core. A coil is made by wrapping several rounds of copper wire over it. A plane mirror is attached to the upper end or upper part of the coil and the upper part of the plane mirror is joined by a phosphor bronze leaf.

The upper end of the phosphor bronze leaf is connected to a torque cap and the torso cap is connected by a wire to terminal T1 and the lower end of the coil is connected by a spring to terminal T2 and this coil is connected to a strong hang between opposite poles of a magnet

### Principle of suspended coil galvanometer

When a streamline coil is freely suspended in a uniform magnetic field in such a way that its plane is parallel to the magnetic field, a deflector moment is applied to the coil which causes it to rotate in its plane magnetic field. Tries to hang from.

If the area of ​​the coil is A, the number of turns in the coil n, the current I in the coil and the intensity of the magnetic field between the poles of the magnet is B, then the deflecting torque on the coil will be maximum.

Due to this deflecting torque, when the coil is rotated, a spasm occurs in its suspension wire, due to which a spasm torque is applied to the coil. This torque opposes the rotation of the coil.

The value of the twisting force is directly proportional to the deflection of the coil. When the twisting moment becomes equal to the deflecting moment, the coil is in equilibrium.

If the crimp angle in the suspension wire at equilibrium is radians, then the twisting torque = C∅ where C is the crimp strength of the suspension wire, i.e. the torque required to produce unit radians in the suspension wire.

### riveted coil galvanometer

I have told you about what is suspended coil galvanometer and what is movable coil galvanometer, so now let’s know what is cleaved coil galvanometer.

riveted coil galvanometer In this, a coil is made by wrapping several rounds of thin copper wire on a rectangular or circular frame of aluminum.

By putting the coil frame on a spindle, the ends of the spindle are fixed in two chulls in such a way that the coil can easily rotate about the spindle.

#### Susceptibility of moving coil galvanometer

If less current is passed through the galvanometer, more deflection is obtained then galvanometer sensitivity (fluorescence sensitivity) goes more, i.e. to have more sensitivity of galvanometer, the value of amount /I should be high, that means more should be received after influencing less current. The amount /I is called sensitivity of galvanometer.

#### ways to increase sensitivity

1. The number of turns in the coil should be n more.
2. The area of ​​the coil should be more A, that is, the coil should be bigger.
3. The magnetic field B must be strong.
4. The tension C of the suspension wire or spring should be low.

#### Features of Movable coil galvanometer

1. Movable coil can be used by keeping the galvanometer in any position.
2. It is less affected by the external magnetic field.
3. Its sensitivity is high.
4. It can be converted into ammeter and voltmeter.
5. In this, the current is directly proportional to the deflection.
6. Its oscillations end quickly.

### How many types of moving coil galvanometer are there?

There are two types of galvanometers (1) Movable magnet galvanometer
(2) Movable coil galvanometer
There are also two types of moving horoscope
(1) suspended coil galvanometer
(2) riveted coil galvanometer

### Describe the features of moving coil galvanometer

(1) The oscillation of the moving coil galvanometer ends quickly.
(2) It can be used in any situation.
(3) Can convert movable coil galvanometer into ammeter and voltmeter.
(4) In this the current is directly proportional to the deflection.

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