Permanent Magnets and Electromagnets
Permanent Magnets and Electromagnets: Overview
This topic covers concepts such as Permanent Magnet, Electromagnets, Transformer Cores, and Telephone Diaphragms.
Important Questions on Permanent Magnets and Electromagnets
What is the right material to make core of a telephone diaphragm?
A transformer _____ is a static device that transmits power from one source to another through electromagnetic induction.
Strength of an electromagnet can be increased by
What is the material best suited in making electro-magnets?
An _____is a type of magnet in which the magnetic field is produced by an electric current. .
Write specialities of the materials used for (i) Electromagnet (ii) Permanent magnet.
Alnico and _____ can be used to make permanent magnets.
(Choose from: Nickel/Neodymium/Aluminium)
Curie temperature is the temperature above which
The core of electromagnet is
The materials suitable for making electromagnets should have
