Question

Temporary magnets and permanent magnets play an important role in our day to day life. A magnet has the ability to attract the magnetic elements. Permanent magnets are made of carbon steel, chromium steel and some alloys like Alnico and Nipermag. Permanent magnets are used in many objects which are necessary for our lives. Magnets are used in junk yard to make new cars and in roller-coasters too. 

(i) State the objectives for this observation. 

(ii) Estimate the values of electromagnets used by people around you.

Answer 1

(i) Objectives :

To understand the need to have temporary and permanent magnets.

To understand the need to use different materials for making magnets. 

(ii) Uses of Electromagnets :

Used in electric bells, loudspeakers, electric motors, telephone diaphragms, electric fan and for sorting scrap metal and for extraction in hospitals, etc.