Magnetic Fields

Question 1

What can we use plotting compasses for?

Answer 1

To investigate the magnetic field around a bar magnet

Question 2

Magnetic fields

Answer 2

The region around a magnet where it will exert a force on another magnet or magnetic material (iron, steel, cobalt, nickel)

Question 3

Uniform magnetic fields

Answer 3

Same strength and direction everywhere

Question 4

Earth’s magnetic field

Answer 4

Magnetic north is in the Southern Hemisphere. A compass needle will point in the direction of earth’s magnetic field. The North Pole of a compass will point to earth’s magnetic South Pole

Question 5

Magnetic field around a current carrying wire

Answer 5

When a current flows through a wire, a magnetic field will be produced round the wire. We can use iron filings as they line up parallel to the magnetic field

Question 6

What determines the strength of the magnetic field?

Answer 6

-size of current
-distance from wire

Question 7

Right hand grip rule

Answer 7

Thumb - direction of current
Other fingers - direction of magnetic field

Question 8

Attraction and repulsion

Answer 8

The poles of a magnet are the places where the magnetic forces it can exert are strongest. When two magnets are brought together they exert a force on one another (opposite poles attract, same repel)