Magnetism and electromagemtis

Question 1

bar magent…

Answer 1

north pole and south

Question 2

when is magnetic field strongest

Answer 2

at the poles of magent

Question 3

what happens if bring2poles close togehter

Answer 3

exter force on each other

Question 4

what does 2like poles do

Answer 4

repel , force of repulsion - force cause magnet apart

Question 5

what does 2unlike poles do

Answer 5

attract

Question 6

whta are example of non-contact force on magent
and why

Answer 6

attraction and repulsion betwen 2 magnetic poles, becayse magent do not have to touch to experience the force.

Question 7

what is permanent magenet and
example

Answer 7

produces its own magnetic field
-bring permanent magent close to another one, can attract or repel depending on direction

Question 8

what is induced magnet

Answer 8

object become a magnet when placed in magnetic field

Question 9

what happens when remove induced magnet from magentic field

Answer 9

induced magent loses most/all of its magnetism quickly

Question 10

what force causes induced magnet

Answer 10

force of attraction

Question 11

example of induced magnet

Answer 11

2object not magnetic, place in permanetn magnet between them makes a magnetic field around. Causes the 2object induced magnet.

Question 12

diagram of permanet and induced magnet

Question 13

what direction is poles of arrow going

Answer 13

always north to south

Question 14

when does field show strongest

Answer 14

the lines getting closer

Question 15

what does the compass needle points in direction to

Answer 15

earths magnetic field

Question 16

why is their earth magentic field

Answer 16

due to earth core

Question 17

4types of magnetic material
what can it be made into

Answer 17

iron, steel (ally of iron), nickel, cobalt
- permanent or induced magnet

Question 18

what is a magnetic field

Answer 18

region around a mgent where force acts on another magnet or on a magnetic material.

Question 19

what is the force between magnet and magnetic material

Answer 19

force is always one of attraction

Question 20

the strentgh of magnetic field depend on

Answer 20

• distance from magnet
  -distance from wire
  -current through wire

Question 21

further from magnet…

Answer 21

experince force of attraction still but smaller than force closer to magnet

Question 22

what is magnetic compass

Answer 22

contain small bar magnet

Question 23

what happens if place magnetic compass near magnet

Answer 23

plots magnetic field

Question 24

method of plotting magnetic field pattern of magnet use compass

Answer 24

1. place south pole compass near north pole of magnet
2. draw a cross at north pole compass
3. move compass to osuth pole on the crss
4. again draw corss at north pole of compass
5. repeat until complete magnetic fiedl line
6. then connect and direction of field use arroaw.

Question 25

when is magnetic fiedl produced around wire

Answer 25

when current flows through conducting wire

Question 26

how to show magnetic field produce around wire by compass

Answer 26

1. current off - compass needle lines up with earths magnetic field
2. turn current on - compass needle deflects = proves magnetic field

Question 27

large current + closer to wire =

Answer 27

stronger magnetc fiedl

Question 28

what is solenoid

Answer 28

formed by shaping a wire

Question 29

magnetic field inside solenoid is…

Answer 29

strong and uniform

Question 30

how does soleniod increase strnegth of magentic field

Answer 30

• increase zie of current=increase strength field
  -increase number of turns of coil (will be greate than previous one)
  -piece of iron inside

Question 31

what is soleniod shape simialr to

Answer 31

bar magnet

Question 32

what is electromagnet

Answer 32

a solenoid with iron core

Question 33

why is electromagnet useful

Answer 33

because can change the strentgh of magnetic field by change size f current.
-turn of and off

Question 34

diagrame of soleniod