MAGNETIC FORCE

Which of these will be attracted to a magnet?

• wooden ruler                

• iron rod              

• copper coin

Iron is a...

• attracted              

• magnet                

• magnetic material        

• repelled

It will be ____________ to magnets but not to other magnetic materials.

• attracted              

• magnet                

• magnetic material        

• repelled

• Both magnets will turn to the right.

• They will attract each other.

• They will repel each other.

Describe how he can tell the magnet and the object made of the magnetic material apart.

• He can place each He can place object near a magnet. If both poles of the magnet attract the same end of the object, then the object is made of a magnetic material. If one pole of the magnet repels one of the ends of the object, then the object is a magnet.

• He can weigh both objects. The heavier one is the magnet.

• He can place each object in water. The magnet will float while the magnetic material will sink.

• He can tap both objects on a hard surface. The magnet will produce a louder sound.

A soft drink can is made of metal, but it is not attracted to magnets. Why?

• All metals are magnetic, but a soft drink can is too light to be attracted to a magnet.

• A soft drink can is made of a non-magnetic metal, such as aluminum, which does not get attracted to magnets.

• The shape of the soft drink can prevents it from being attracted to a magnet.

• Magnets only attract objects that are painted, and soft drink cans are usually unpainted.

Which of these describes magnetic force?

• It can act over a distance.

• It can be seen.

• It is the strongest at the centre of a magnet.

• magnetic force is strongest at the poles of a magnet

   

• magnetic force repels magnetic objects

• magnets have different strengths

The force that ____________ or ____________ a magnetic object or another magnet is called magnetic ____________.

• attracts, repels, force

• attracts, repels, object

• move, attract, force

• attracts, repels, object

• Nur’s diagram is correct. Magnetic force is strongest at the poles of a magnet, so most of the iron filings are attracted to the poles of the bar magnet.

• Leena’s diagram is correct. Magnetic force is evenly spread across the entire bar magnet, so the iron filings are attracted to all parts of the magnet equally.

• Both diagrams are correct. Iron filings are attracted randomly to different parts of the magnet.

• Neither diagram is correct. Iron filings are not affected by a bar magnet.