Key Concepts 4- Magnetism

​Key Concepts 4- Magnetism

​•Magnetic materials are attracted by a magnet and can be magnetized.

•Although all magnetic materials are metallic, not all metals are magnetic.

​

•Magnetic materials (ferrous), such as iron, steel, nickel (the coin) and cobalt, are attracted to magnets

• non-magnetic materials (Non-ferrous) like copper, sliver, aluminum, zinc, etc. are not attracted to a magnet.

​

​Magnetic Material

Multiple Choice

Which group contains only non-ferrous metals?

• aluminium, brass, iron

• copper, iron, steel

• copper, lead, steel

• copper, gold , zinc

Multiple Choice

Which statement about a magnet is not correct?

• It can attract another magnet

• It can attract an unmagnetised piece

  of iron

• It can repel another magnet

• It can repel an unmagnetised piece of iron

Multiple Choice

Which row correctly shows whether copper and steel are ferrous or non-ferrous?

• A

• B

• C

• D

​Where is the North? Demo

​a bar magnet to a thread and suspends it freely. When it suspended freely, it will always align itself in a north-south direction.

​

​Poles of a Magnet

​Magnetic Fields:​

All magnets are surrounded by a magnetic field. A magnetic field is defined as: The region around a magnet where a force acts on another magnet or on a magnetic material

​

Magnetic field lines are used to represent the strength and direction of a magnetic field.

​Poles of a Magnet

​The ends of a magnet are called the poles Magnets have two poles: a north pole (N) and a south pole (S) The north pole of a magnet points roughly in the direction of the Earth’s geographical north pole (magnetic south of the Earth) and hence called as north-seeking pole. the south pole of a magnet is the south-seeking pole.

​Magnetic Forces

Draw

Summarize the Magnatic force Law

​Important Fact:​

If it can only be attracted and not repelled, then it is a magnetic Material

​Magnetic Forces

​•Two like poles (S and S or N and N) repel each other

•Two unlike poles (S and N) attract each other

•The attraction or repulsion between two magnetic poles is an example of a non-contact force

Multiple Choice

The table shows the forces that exist between magnetic poles. Which row is

• A

• B

• C

• D

​The diagram below shows a magnet held close to a piece of metal that is suspended by a light cotton thread. The piece of metal is attracted towards the magnet.

​

​

Which of the following rows in the table gives the correct type of pole at X and the correct material of the suspended piece of metal?​

​

​

​

Multiple Choice

The ends of three metal rods are tested by holding end Q of rod 1 close to the others in turn.

• Rod 1 only

• Rod 1 and rod 2

• Rod 1 and rod 3

• Rod 3 only

​Mapping the Magnetic field line

Physics Simulation: Magnetic Field

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