The shape of magnet in moving coil galvanometer to make the radial magnetic field is concave magnets.
Why has the magnet a horse shoe shape in a moving coil galvanometer?
A horse shoe shaped magnet used in moving coil galvanomete because it create uniform radial magnetic field. A radial field is always perpendicular to a conductor rotating about an axis passing through the centre of the concave-shaped pole faces and parallel to the faces.
What is the working 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. Created by Mahesh Shenoy.
Why Earth’s magnetic field does not affect the working of a moving coil galvanometer?
earths magnetic field does not affect the working of moving coil galvanometer why ? Answer: This is because earth’s magnetic field is very weak as compared as compared to strong radial magnetic field employed in the moving coil galvanometer.
Can a moving coil galvanometer be used to detect AC in a circuit?
A moving coil galvanometer cannot be used to detect a.c. in a circuit, since it measures the average value of current and the average value of a.c. over a complete cycle is zero.
Why are pole pieces made cylindrical?
In a moving coil galvanometer, the magnetic pole pieces are made cylindrical and a soft iron core is placed at the centre of the coil to make the magnetic field strong and radial.
What are the advantages and disadvantages of moving coil galvanometer?
Advantages And Disadvantages Of A Moving Coil Galvanometer
- High sensitivity.
- Not easily affected by stray magnetic fields.
- The torque to weight ratio is high.
- High accuracy and reliability.
What is difference between galvanometer and ammeter?
The major significant difference between ammeter and galvanometer is that ammeter shows only the magnitude of the current. Whereas, the galvanometer shows both the direction and magnitude of the current.
Why galvanometer is not used to measure current?
Solution : A galvanometer as such cannot be used to measure the current in a circuit due to following reasons: (i) Galvanometer is quite a sensitive device. … (ii) While measuring current, the galvanometer whose resistance is large than ammeter has to be connected in series of the circuit.29 мая 2019 г.
What is the main function of soft iron core used in a moving coil galvanometer?
A soft iron core is used in a moving coil galvanometer. The soft iron core attracts the magnetic lines of force and hence the strength of the magnetic field increases if we use soft iron core. Thus the sensitivity of galvanometer increases.
On what factors does the voltage sensitivity of galvanometer depend?
Explanation: It depends on number of turns, coil area, restoring force per unit twist, and magnetic field.
Why is a current loop considered a magnetic dipole?
Answer. Let us consider a plane loop of wire carrying current. At the upper face of loop, the current is anticlockwise, therefore it will behave as north pole. … The current carrying stem of two equal and opposite magnetic poles and hence is a magnetic dipole.
What are the types of galvanometer?
Some of the different types of galvanometer include Tangent galvanometer, Astatic galvanometer, Mirror galvanometer and Ballistic galvanometer. However, today the main type of galvanometer type that is used widely is the D’Arsonval/Weston type or the moving coil type.
How ammeter is made from galvanometer?
A galvanometer can detect only small currents. Thus, to measure large currents it is converted into an ammeter. It can be converted into an ammeter by connecting a low resistance called shunt resistance in parallel to the galvanometer.
On what interaction is the principle of galvanometer based?
The principle of galvanometer is based on the interaction of current and magnetic field.