Why we use concave mirror in moving coil galvanometer?
Table of Contents
- 1 Why we use concave mirror in moving coil galvanometer?
- 2 Why mirror is used in galvanometer?
- 3 What is the use of concave shaped magnetic poles in a moving coil galvanometer What is the use of soft iron core in a moving coil galvanometer?
- 4 What is the principle of moving coil galvanometer?
- 5 What is optical lever in mirror galvanometer?
- 6 What’s the function of mirror in ammeter?
- 7 What is a moving coil galvanometer?
- 8 What is principle of moving coil galvanometer?
Why we use concave mirror in moving coil galvanometer?
The pole pieces of the galvanometer are made concave so that the current-carrying coil and the magnetic field are always perpendicular to each other. This equal and opposite force forms a couple and rotates the coil.
Why mirror is used in galvanometer?
A lamp is positioned behind the scale; its light passes through an aperture in the scale that is directed at the galvanometer’s mirror. The mirror reflects that light back onto the scale; when the magnet/mirror is deflected by an electric current, the light deflects with it, measured by the scale.
What is the use of concave shaped magnetic poles in a moving coil galvanometer What is the use of soft iron core in a moving coil galvanometer?
In a moving coil galvanometer, the magnetic pole pieces are usually constructed cylindrical and the soft iron core is placed at the centre of the coil. The sole purpose of doing so is to ensure that the magnetic field produced in the moving coil galvanometer is strong and also radial.
Why is moving coil galvanometer used?
A moving coil galvanometer is an instrument which is used to measure electric currents. It is a sensitive electromagnetic device which can measure low currents even of the order of a few microamperes.
Why soft iron core is used in galvanometer?
In order to produce magnetic field inside the galvanometer device, we can use any magnetic material but soft iron core is especially used in galvanometer because Soft iron is ferromagnetic in nature which in turn strengthen the magnetic field lines, and stronger the magnetic field lines passing through the coil larger …
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 optical lever in mirror galvanometer?
An optical lever is a beam of light used as a pointer. It has an advantage of magnifying by two the rotation of the system to which the mirror is attached as the angle of rotation of the reflected light is twice the angle of rotation of the mirror.
What’s the function of mirror in ammeter?
The mirror is there to reflect the needle in order to most accurately read the value shown on the meter. It helps finding a correct viewpoint. If you’re looking from an angle, you might misread the position of the needle.
What is the main function of concave shape of pole pieces?
Answer: Pole faces are concave to make the magnetic field radial to keep it always normal to the moving coil.
What advantage does a curved shaped magnet holds in a moving coil galvanometer?
Increase space for rotation of coil.
What is a moving coil galvanometer?
Moving coil galvanometer is an electromagnetic device that can measure small values of current. It consists of permanent horseshoe magnets, coil, soft iron core, pivoted spring, non-metallic frame, scale, and pointer.