Unit 8.3 Quiz 4

Based on the magnetic field lines shown, what is the orientation of the mystery magnet (left --- right)?

• Cannot be determined.

• Could be either direction.

• N --- S

• S --- N

Answer explanation

The magnetic field lines indicate that they emerge from the North pole and enter the South pole. Therefore, the orientation of the mystery magnet must be South to North (S --- N).

Tags

NGSS.MS-PS2-5

NGSS.MS-PS2-3

Two N--S magnets are glued to a sheet of paper. Iron filings are sprinkled, and the table is tapped several times. Which image matches what the filings should look like?

• A

• B

• C

• D

Answer explanation

The correct choice is A because it shows the typical magnetic field pattern of two N-S magnets, with lines emerging from the north pole and entering the south pole, which is what the iron filings will align with.

Tags

NGSS.MS-PS2-3

Which diagram correctly represents the direction of the magnetic field around a bar magnet?

• A

• B

• C

• D

Answer explanation

Choice A correctly shows the magnetic field lines emanating from the north pole and looping back to the south pole of the bar magnet, illustrating the conventional direction of magnetic fields.

Tags

NGSS.MS-PS2-5

NGSS.MS-PS2-3

In the diagram, at which point is the magnetic field strongest?

• A

• B

• C

• D

Answer explanation

The magnetic field is strongest at point A because it is closest to the source of the magnetic field lines, where they are most concentrated. Points B, C, and D are farther away, resulting in a weaker magnetic field.

Tags

NGSS.MS-PS2-5

NGSS.MS-PS2-3

If a small compass is placed near a bar magnet, which diagram correctly shows the position of the compass needle?

• A

• B

• C

• D

Answer explanation

The compass needle aligns with the magnetic field of the bar magnet. In diagram A, the needle points towards the magnet's north pole, indicating the correct orientation. Diagrams B, C, and D do not show this alignment.

Tags

NGSS.MS-PS2-5

NGSS.MS-PS2-3

How can magnets cause objects to have kinetic energy?

• A magnetic force can convert kinetic energy stored in a magnetic field to potential energy.

• Kinetic energy can convert potential energy stored in a gravitational field.

• A magnetic energy can convert potential energy stored in a gravitational field to kinetic energy.

• A magnetic force can convert potential energy stored in a magnetic field to kinetic energy.

Answer explanation

A magnetic force can convert potential energy stored in a magnetic field to kinetic energy, allowing objects to move. This is the correct choice as it directly relates to how magnets influence motion.

Tags

NGSS.MS-PS2-5

NGSS.MS-PS3-5

The figure shows an iron nail with an insulated wire coiled around it. The wire is connected to a battery. What will happen to the nail when current flows through the wire?

• The nail will become a magnet.

• Electric current will flow through the nail.

• The nail will melt.

• Nothing will happen to the nail.

Answer explanation

When current flows through the coiled wire around the nail, it creates a magnetic field, magnetizing the nail. This phenomenon is known as electromagnetism, making the nail act as a magnet.

Tags

NGSS.MS-PS2-5

An iron rod becomes magnetic when:

• all of the positive and negative charges move to opposite ends of the rod.

• all of the negative charges move to one end since positive charges are not free to move.

• a large number of domains of aligned atoms become aligned with each other.

• it comes into contact with ferromagnetic objects.

Answer explanation

An iron rod becomes magnetic when a large number of domains of aligned atoms become aligned with each other, allowing the rod to exhibit a net magnetic field.