AKS 9: Magnetism and Electromagnetism

The picture is an example of an: (a)  

• Electric circuit
• Electromagnet
• Electric nail
• Electric power cell

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You know this substance is magnetized because (a)  

• all the domains have right angles
• the arrows are drawn in red
• the domains are aligned
• the domains are random

To make this electromagnet stronger you could:

• use less wire

• have fewer wire coils around the nail

• have more wire coils around the nail

• use a plastic core

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What happens to the domains of a ferromagnetic material when they are placed in a strong magnetic field?

• The domains aligned with the field become bigger

• The number of magnetic domains increases

• All the magnetic domains point in the same direction

• The magnetic domains point randomly

Voltage can be induced in a wire by

• moving the wire near a magnet.

• moving a magnet near the wire.

• changing the current in a nearby wire.

• all of these

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What would happen if I move a bar magnet in and out of a coil of copper wire?

• Electric current would disappear 

• The magnet would explode 

• Electric current will flow through the wire (voltage induced)

• It would produce a gravitational field

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A magnet can move in a coil of wire to produce electricity in which system? (a)  

• Generator
• Motor
• Magnet
• Transformer

Which action will increase the deflection of the galvanometer pointer?

• The magnetic pole is reversed

• The number of turns of coils is increased

• The coil is made from insulated wire

• The magnet is slowly pushed into the coil

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If you break a bar magnet in half, each half...

(a)  

• becomes a bar magnet with two poles.
• has only one pole.
• has only only a North pole.
• has only a South pole.
• loses all magnetic properties.

The voltmeter is at 0 in this image. How would you manipulate the experiment to create electricity (measured in volts)?

• Flip the magnet around so the North pole is facing out
• Move the magnet back and forth
• Take the magnet out
• Add more coils around the paper cylinder

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