1 Answer. (i) Soft iron has less retentivity so it acquires the magnetic properties only when the current flows through the coil wound on it and loses the magnetic properties as the current is switched off. (ii) The soft iron intensifies the magnetic field of the electromagnet because of its high permeability.
Why soft iron is used in electromagnet?
Electromagnets are made of soft iron because soft iron has low retentivity and low coercive force or low coercivity. Soft iron is a soft magnetic material.
Can we use steel instead of soft iron for making the core of an electromagnet Why?
Core of an electromagnet should be of soft iron and not of steel because soft iron loses all its magnetism when current in the coil is switched off but steel does not lose its magnetism when the current is stopped.
Why soft iron is used in solenoid?
The simplest motion producer is a solenoid, which consists of a coil with a soft iron core (or armature) which slips easily in and out of the coil. Soft iron is used because it does not retain its magnetism when the current is switched off; in other words, it does not become permanently magnetized.
What is soft iron used for?
Soft iron. “Soft” (annealed) iron is used in magnetic assemblies, direct current (DC) electromagnets and in some electric motors; and it can create a concentrated field that is as much as 50,000 times more intense than an air core.
What material is used in electromagnets?
Electromagnets consist of coils, usually copper, wrapped tightly around a laminated core of ferromagnetic material (soft iron, steel, cobalt).
Why soft iron is used in many parts of electrical machines?
(1) Low hysteresis loss and low permeability. (4) High hysteresis loss and high permeability. … Sol.
What will you prefer soft iron or steel to make an electromagnet?
Accepted Answer: We will prefer soft iron to make an electromagnet because soft iron does not stay magnetised and steel does,so steel will still be magnetic when you turn it off.
Why an electromagnet is called a temporary magnet?
An electromagnet is called a temporary magnet because it produces magnetic field so long as current flows in its coil.
Can we change the polarity of a permanent magnet?
Like poles repel and unlike poles attract, and although the poles on a magnet may seem fixed, they can change under certain circumstances. … It’s possible to change the polarity of both electromagnets and permanent magnets using simple equipment and techniques.
Does soft iron have high permeability?
Any material with a relative permeability higher than one will increase the strength of an electromagnet when used as a core. … However, iron has a relative permeability of 5,000 when it is 99.8 percent pure, and the relative permeability of soft iron with 99.95 percent purity is a massive 200,000.
What is the difference between hard and soft iron?
Hard iron is an iron which retains their magnetism and is difficult to magnetize. Soft iron is iron that is easily magnetized and demagnetized with a small change of magnetic field. Hard irons are also referred to as hard magnetic materials. Soft iron is also referred to as soft magnetic materials.
What happens when an iron rod is inserted into a solenoid?
Explanation: When an iron rod is inserted inside a solenoid the magnetic field inside the solenoid increases due to the high magnetic permeability of iron. Due to the increased magnetic field, the magnetic flux also increases.
What is the difference between soft iron and steel?
Iron gets magnetized faster but loses its magnetism as soon as the inducing magnet is removed. Hence soft iron is said to have high susceptibility but low retentivity. … Steel is slow to be magnetized but retains the acquired magnetism for a long time. Steel is said to have low susceptibility but high retentivity.
What do you mean by soft iron?
Definition of ‘soft iron’
a. iron that has a low carbon content and is easily magnetized and demagnetized with a small hysteresis loss.
Why is iron used in transformers?
In real transformers, the two coils are wound onto the same iron core. The purpose of the iron core is to channel the magnetic flux generated by the current flowing around the primary coil, so that as much of it as possible also links the secondary coil.