Magnetism

Question 1

Describe some common properties of magnets. (5)

Answer 1

MAGNETS HAVE POLES: (1)
Opposite Poles Attract (1)
Same Poles Repel (1)

Domains in a magnet are all lined up. (1)

They obtain an invisible force field: the magnetic field. (1)

Question 2

Describe how to plot the magnetic field using plotting
compasses. Arrows to be pointing in the correct direction. (5)

Answer 2

Magnetic fields can be mapped out using small plotting compasses:

1. Place the plotting compass near the magnet on a piece of paper (1)
2. Mark the direction the compass needle points (1)
3. Move the plotting compass to many different positions in the magnetic field, marking the needle direction each time (1)
4. Join the points to show the field lines (1)

The needle of a plotting compass points to the south pole of the magnet. (1)

Question 3

Describe how to make an electromagnet including how to
make it stronger. (3)

Answer 3

Flow a current through a wire. (1)

1. Using more turns on the coil of wire will produce a stronger magnetic field. (1)
2. Increasing the current through the wire creates a greater current which will produce a stronger magnetic field
   A greater current will produce a stronger magnetic field. (1)

Question 4

List some common uses of electromagnets. (3)

Answer 4

Any three of:

Automatic door locks,
Headphones,
Scrap yard cranes
Magnetic, Levitating trains (3)