Magnetic fields (7)

Question 1

Magnetic field

Answer 1

a region where a magnet exerts a force on other magnets or magnetic materials, even if they are not in contact.

Question 2

Electromagnets made using a soft magnetic core

Answer 2

lose their magnetism if the current is turned off (e.g. iron).

Question 3

Electromagnets made using a hard magnetic core

Answer 3

retain their magnetism when the current is turned off (e.g. steel).

Question 4

Magnetic flux density

Answer 4

the number of magnetic flux lines that pass through an area of 1m2.

Question 5

Tesla

Answer 5

the flux density that causes a force of 1N on a 1m wire carrying a current of 1A at right angles to the flux.

Question 6

Cyclotron

Answer 6

a particle accelerator that accelerates charged particles through a spiral path using a fixed magnetic field and an alternating potential difference.

Question 7

Synchrotron

Answer 7

a particle accelerator that accelerates charged particles through a circular path using a varying magnetic field.