Magnetic

Question 1

Magnet

Answer 1

Magnet has a North Pole and South Pole

Like charge repel and unlike charge contract

The force attraction decrease as the distance between the pole increase.

Material which attracted by magnet a say to be ferromagnetic. These include iron, steel nickel, cobalt and magnetic alloys.

Question 2

Magnetic field

Answer 2

The region around a magnet which piece of magnet material will experience a force called magnetic will experience a force called magnetic field.

Magnetic field line and flux pattern can be observed using an iron filling or a plotted using a plotted compass. A fine line which pass through a given area are magnetic flux over the area.

Question 3

Iron filling

Answer 3

Iron filling which can be sprinkled around a magnet which an align field line and a shape magnetic field will be seen. This method is specifically useful when observing the shape of a field when there are more than 1 magnet. To prevent the filling from sticky onto the magnet, magnet are placed under a piece of paper or wrapped on a firm plastic

Question 4

Magnetic affects of a current

Answer 4

Magnetic field around a wire

If electric current pass through a wire, weak magnetic field is produced

Magnetic field produced by current carrying coil has these features:

If field is similar to that from agar magnet, there are a magnetic pole at the end of the coil.

Increasing the current increase the strength of field

Increasing the number of turns on the coil increase the strength of the field.

Question 5

Electromagnetic

Answer 5

Electromagnetic is a coil consisting of several hundred turns of insulated copper, using iron. When current flow through the coil produced a magnetic field

When a soft iron core the magnetic field is only temporarily as soon as the current is switched off it loose its magnetic field.

Steel would not be ideal as a core because it would become permanently magnetized.