simple phenomena of magnetism

Question 1

what are the 2 poles of a magnet

Answer 1

north and south

Question 2

what are examples of ferrous magnetic materials

Answer 2

iron and steel

Question 3

what are non ferrous materials

Answer 3

non- magnetic materials eg: copper and aluminium

Question 4

what is a hard and soft magnet

Answer 4

hard: retains its magnetism ( steel)
soft: loses its magnetism easily ( iron)

Question 5

what are permenant magnets made of

Answer 5

steel

Question 7

what is induced magnetism

Answer 7

a material is made into a magnet by its closeness to a magnetic material

Question 8

how can a magnet me demagnetized

Answer 8

hitting it or heating
placing a magnet inside a coil,, using a ac current, then slowly remiving the magnet

Question 9

what is a magnetic field

Answer 9

region where a pagnetic pole experiences a force

Question 10

what is the only test for a magnet

Answer 10

repulsion

Question 11

how to make a permenant magnet

Answer 11

place a steel rod insde a coil, use highh dc current for a time, leave steel inside then turn of current

Question 12

how to increase the strength of a electro magnet

Answer 12

use a iron core
more current
more turns of wire

Question 13

what is iron in terms of magnetism

Answer 13

temporary soft magnet

Question 14

what are examples of electromagnets

Answer 14

electric bells, loudspeekers, some microphones