P15 - Magnets

Question 1

like poles

Answer 1

repel

Question 2

unlike poles

Answer 2

attract

Question 3

magnetic materials eg

Answer 3

iron or steel

Question 4

permanent magnets are made from

Answer 4

steel

Question 5

why are permanent magnets are made from steel instead of iron

Answer 5

-doesn’t lose its magnetism easily
-iron loses it easier

Question 6

magnetic field

Answer 6

any other magnetic material placed in this space will experience a force caused by the first magnet

Question 7

magnetic field line are more concentrated

Answer 7

at poles

Question 8

magnetic field lines direction

Answer 8

always north to south

Question 9

greater distance from magnet

Answer 9

weaker strength of magnetic field lines

Question 10

induced magnetism

Answer 10

magnetised by placing in a magnetic field

Question 11

induced magnetism poles of rod and magnet

Answer 11

nearest pole of rod and magnet always have opposite polarity

Question 12

magnetic field lines in current carrying wire

Answer 12

magnetic field lines surround it

Question 13

corkscrew rule

Answer 13

right hand
thumb = direction of current
fist = direction of field lines

Question 14

corkscrew principle

Answer 14

reversing direction of current
reverses direction of magnetic field

Question 15

solenoids

Answer 15

long coil of insulated wire

Question 16

solenoid magnetic field lines produced

Answer 16

produced when current passes through

Question 17

solenoids magnetic field lines increases strength when

Answer 17

current is increased

Question 18

inside solenoid magnetic field lines

Answer 18

field is much stronger than if wire was straight
-field lines are stronger + uniform
-parallel to axis of solenoid + same direction

Question 19

outside solenoid magnetic field lines

Answer 19

-similar to lines of a bar magnet
-complete loop as it passes through inside

Question 20

the current flows which direction from the view of the s pole

Answer 20

clockwise

Question 21

the current flows which direction from the view of the n pole

Answer 21

anti clockwise

Question 22

solenoid rule

Answer 22

-wrap finger in direction of current
- thumb of right hand points to north pole

Question 23

electromagnets switched off

Answer 23

current switched off = loses its magnetism

Question 24

electromagnets

Answer 24

solenoid is wrapped around iron core
-current passes through wire = mg field
-magnetises iron core

Question 25

mg field lines around current carrying conductor

Answer 25

circles centred onto wire
-in a perpendicular plane to wire

Question 26

scrapyard crane

Answer 26

lifts steel frame of cars
drops when circuit is cut

Question 27

circuit breaker

Answer 27

current is too large
-switch is opened by EM

Question 28

EM uses eg

Answer 28

scrapyard crane
circuit breaker
electric bell
relay

Question 29

circuit breaker, relay, electric bell works by

Answer 29

-attracting an iron armature which opens a switch