Unit 8.3 Quiz 2

Which of the following pure substances will NOT interact with a magnet?

• iron

• nickel

• copper

• cobalt

Answer explanation

Copper is a non-magnetic metal, meaning it does not interact with magnets. In contrast, iron, nickel, and cobalt are ferromagnetic materials that are attracted to magnets.

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Which of the following will become a magnet when connected to a battery?

• string

• plastic zip tie

• copper coil

• compass

Answer explanation

A copper coil becomes a magnet when connected to a battery due to the flow of electric current, which generates a magnetic field. The other options do not have magnetic properties when electrified.

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Each of the three magnets shown has been dipped into the substance below it. Which of the substances could be coffee?

• Substances A and B only

• Substance A only

• Substance B only

• Substance C only

Answer explanation

Substance C is the only one that matches the characteristics of coffee, likely due to its color and consistency. Substances A and B do not exhibit the typical properties associated with coffee.

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Some cabinets use a magnet and an iron plate as shown in this picture. How is this useful? The magnet and the iron plate:

• make it easier to see inside the cabinet.

• can hold the door of the cabinet closed.

• help small children reach the cabinet.

• allow more things to be put in the cabinet.

Answer explanation

The magnet and iron plate work together to hold the cabinet door closed, preventing it from swinging open unintentionally. This is essential for keeping the contents secure and ensuring safety, especially in homes with small children.

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A compass needle is an example of:

• a piece of iron.

• a permanent magnet.

• an electromagnet.

• a ferromagnet.

Answer explanation

A compass needle is a permanent magnet because it maintains a consistent magnetic field and aligns itself with the Earth's magnetic field, allowing it to point north.

What will happen to the two magnets below if they are released?

• The magnets will move further apart.

• The magnets will both move to the left.

• The magnets will both move to the right.

• The magnets will move toward each other.

Answer explanation

The magnets will move further apart because they are likely of the same polarity, causing a repulsive force between them. This repulsion will push them away from each other when released.

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Bar magnets have two ends called:

• forces.

• fields.

• poles.

• materials.

Answer explanation

Bar magnets have two ends known as poles. Each pole generates a magnetic field, with one being the north pole and the other the south pole, which is essential for their magnetic properties.

The space around a magnet that attracts a magnetic substance is called the:

• permanent magnet.

• magnetic field.

• south pole.

• north pole.

Answer explanation

The space around a magnet that attracts magnetic substances is known as the magnetic field. It is the area where magnetic forces are exerted, unlike the terms 'north pole' and 'south pole' which refer to specific ends of a magnet.

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