Magnetism

Question 1

what type of force is magnetism?

Answer 1

non contact

Question 2

name 4 magnetic materials

Answer 2

iron, nickel and cobalt. steel is mostly iron so it is also magnetic

Question 3

what are the two ends of a bar magnet called?

Answer 3

north seeking pole and south seeking pole

Question 4

which two ends will attract each other?

Answer 4

a north and South Pole

Question 5

which two fooled will repeal each other?

Answer 5

2 norths or 2 Souths

Question 6

what is the space around where a magnet has an effect called?

Answer 6

a magnetic field

Question 7

how can you find the shape of a magnetic field?

Answer 7

using iron fillings or using a plotting compass

Question 8

what is a compass?

Answer 8

A small magnets that always points North

Question 9

what does the wire with electricity flowing through it have?

Answer 9

A magnetic field

Question 10

how can you make an electromagnet stronger?

Answer 10

increasing the number of turns in the cool of wire, increasing the current or using an iron core

Question 11

describe a reed switch

Answer 11

has 2 thin pieces of iron inside it. if a magnet is held near the switch the pieces of iron are magnetised and touch

Question 12

what is any switch that is worked by electricity called?

Answer 12

a relay

Question 13

what are relays used for?

Answer 13

to make thugs safer

Question 14

why is a relay used in a car?

Answer 14

so that the driver doesn’t have to touch any part of the circuit that has a high current

Question 15

what is the motor effect?

Answer 15

when a current carrying wire or coil exerts a force on a permanent magnet

Question 16

how can you build a simple electric Motor?

Answer 16

using a coil of wire that is free to rotate between two opposite magnetic poles

Question 17

what happens when an Electric current flows through the coil?

Answer 17

The coil experiences a force and moves

Question 18

what must happen to the direction of the current on a simple electric motor?

Answer 18

it’s must be reversed every half turn otherwise the coil will stop

Question 19

how do you achieve the Simple motor reversing every half turn?

Answer 19

using a conducting ring split in two. called a split ring or commutator

Question 20

what is the catapult effect?

Answer 20

when a current is passed through a wire it produces a magnetic field. if the wire is in an existing magnetic field it will feed a force. this can move the wire

Question 21

what is another name for magnetic switches?

Answer 21

relays

Question 22

what do magnetic switches/relays do?

Answer 22

let a small current switch on a large curren