Question

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Answer 1

Answer:

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Answer 2

Explanation

(1) Change in magnetic field or change in magnetic flux induces electric filed, it is called as magnetic induction, while Change in current induces magnetic field which is called induced magnetism.

(2) Retentivity is a material's ability to retain a certain amount of magnetization when the magnetizing field is removed after achieving saturation. Susceptibility is a measure of how much a material will become magnetized in an applied magnetic field.

(3) Magnetic permeability also referred to as permeability in electromagnetism is a property of a magnetic material which supports the formation of a magnetic field. The term was coined by Oliver Heaviside in the year 1885. Magnetic permeability is a property that basically allows magnetic lines of force to pass through a material.

(4)  An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole, denoting the centre of the coil. Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it. The poles of an electromagnet can even be reversed by reversing the flow of electricity. An electromagnet works because electric current produces a magnetic field.