G101A - Mag Part 1,2 & 3

A magnet has two poles (north and south pole), so named because a magnet, if allowed to move freely, aligns itself so its north pole points to the Earth’s magnetic North Pole

• True

• False

Which of the following diagrams represent the conventional direction of flux outside a bar magnet?

• 
• 

What would happen when these bar magnets are brought close to each other?

• The magnets will attract each other

• The magnets will repel each other

• There will be no effect due to the lack of south poles

Materials containing iron typically have a strong attraction to magnetic fields. These are known as:

• diamagnetic materials

• ferromagnetic materials

• paramagnetic materials

Some materials, like aluminium, have only a very weak attraction to magnetic fields. These are known as:

• diamagnetic materials

• ferromagnetic materials

• paramagnetic materials

Some materials, like water, are repelled by a magnetic field. These are known as:

• diamagnetic materials

• ferromagnetic materials

• paramagnetic materials

The purpose of magnetic screening is to:

• increase the strength of a magnetic field

• shield equipment from a magnetic field

• eliminate a magnetic field

• saturate a magnetic field

Which of the following materials would be best for magnetic screening?

• Aluminium

• Brass

• Plastic

• Steel

What would be a common application of a reed switch?

• Used for switching high current circuits

• Used with alarm systems sensing circuits

• Used for temperature control

• Used for high voltage switching

Based on the direction of current flow, the direction of the magnetic field would be:

• clockwise around the conductor

• anticlockwise around the conductor