Keywords Electricity And Magnetism

Question 1

Magnetism

Answer 1

the effect of magnet poles on magnetic material

Question 2

Magnet

Answer 2

a material or object that produces a magnetic field

Question 3

Peer review

Answer 3

making scientific research available to others to repeat and debate

Question 4

Non-contact force

Answer 4

a force that arises even though objects are not touching – this is due to the interaction of fields.

Question 5

attract

Answer 5

to pull towards another object

Question 6

pole

Answer 6

the end of a magnet which is called the north pole or the south pole

Question 7

repel

Answer 7

to push away from another object

Question 8

permanent magnet

Answer 8

a magnet that keeps its magnetism for a long time

Question 9

temporary magnet

Answer 9

an object that is attracted by a magnet and shows magnetic properties when in a magnetic field

Question 10

electromagnet

Answer 10

a type of temporary magnet that is magnetic only when an electric current passes through it

Question 11

domain

Answer 11

groups of atoms bound together that are aligned in the same magnetic direction

Question 12

magnetic field

Answer 12

the space in which a magnetic material feels a magnetic force

Question 13

strength

Answer 13

the ability of a solid to withstand a force

Question 14

field lines

Answer 14

to show the shape and size of a (magnetic) field

Question 15

core

Answer 15

the piece of iron inside the coil of an electromagnet which makes the magnetic field stronger

Question 16

subjective

Answer 16

when different people may interpret the results of an investigation differently

Question 17

reliability

Answer 17

a measure of how good data is

Question 18

repeatability

Answer 18

when repeat tests of an investigation made by the same experimenter give similar results

Question 19

reproduceibility

Answer 19

when an investigation method is repeated exactly and the same results are obtained by a different experimenter

Question 20

accuracy

Answer 20

how close data is to the true value

Question 21

precision

Answer 21

how close measured values are for repeated results

Question 22

geodynamic theory

Answer 22

magnetic domains within a (core) liquid line up to create a weak magnetic field

Question 23

magnetosphere

Answer 23

magnetic field around the Earth

Question 24

solar wind

Answer 24

a stream of charged particles released from the upper atmosphere of the Sun

Question 25

electric current

Answer 25

a flow of positive charge – these are usually caused by the movement of electrons, which have a negative charge) moving in the opposite direction

Question 26

armature

Answer 26

the iron bar inside an electric bell

Question 27

contact

Answer 27

the point at which a circuit is made e.g. a switch

Question 28

circuit breaker

Answer 28

a device that breaks a circuit when too high a current is drawn from the mains

Question 29

electric motor

Answer 29

this transfers energy by electricity and uses magnetic force to cause movement and do useful work

Question 30

motor effect

Answer 30

a wire carrying a current moves when placed in an electric field

Question 31

direct current(D.C.)

Answer 31

current that always flows in one direction