Magnets And Magnetic Fields

Question 1

what do all magnets have

Answer 1

• two poles

- north and south

Question 2

what do all magnets produce as a result of their poles

Answer 2

a magnetic field

Question 3

what is a magnetic field

Answer 3

a region where other magnets or magnetic materials experience a force

Question 4

what is used to visually display a magnetic field and its strength

Answer 4

magnetic field lines

Question 5

which direction do magnetic field lines go when showing the direction of a magnetic field

Answer 5

• from north to south

- they show which way a force would act on a north pole at that point in the field

Question 6

what do closer magnetic field lines indicate

Answer 6

a stronger magnetic field

Question 7

how does the strength of a magnetic field you feel change as you travel further away from it

Answer 7

the field you feel becomes weaker

Question 8

where are magnetic fields strongest, what reflects this and what does it mean

Answer 8

• magnetic fields are strongest at the poles of the magnet
• indicated through more and closer field lines at the poles
• means that magnetic forces are strongest at the poles

Question 9

what is created between two magnets

Answer 9

a magnetic force which can be attractive or repulsive

Question 10

what is the effect of bringing two poles, of magnets, that are the same together (like poles)

Answer 10

• they will repel each other
• reflected through field lines showing two north poles would be trying to push out (like two protons)
• and two south poles would be trying to pull in (like two electrons)

Question 11

what is the effect of bringing two poles, of magnets, that are different together (unlike poles)

Answer 11

• they will attract each other
• reflected through field lines showing a north pole pushing out and a south pole pulling in, so the south pole would ‘catch’ the north pole (like a proton and electron)

Question 12

what does placing the north and south poles of two bar magnets near each other create

Answer 12

• a uniform field between the two poles

- magnetic field is the same strength everywhere between the poles

Question 13

how should you draw a uniform magnetic field in an exam

Answer 13

at least 3 field lines parallel to each other and all the same distance apart

Question 14

how do the earth’s poles relate to its magnetic poles

Answer 14

• the north pole is actually the magnetic south pole

- the south pole is actually the magnetic north pole

Question 15

what does the magnetic nature of the earth show or reveal

Answer 15

that the earth’s core must be magnetic