Bell ringer 11/12: Electromagnetic Force

Ms. Owens assigned her students to create an electromagnet. The group that creates the electromagnet that pick ups the most paperclips wins the challenge. Morgan and Gracie are very excited and begin to plan their electromagnet design. Their materials include: various batteries, different sizes of iron nails, and a large roll of copper wire. Morgan and Gracie built their electromagnet and collected data shown as shown in the graph.

Morgan and Gracie won the challenge by picking up 45 paperclips. What did the winning electromagnet contain?

• A)a 6 V battery

• B)a 3 V battery

• C)a 4.5 V battery

• D)a 1/5 V battery

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

NGSS.MS-PS3-1

Used car lots and metal scrapyards use electromagnets to move pieces of metal from one place to another. If the electromagnet/crane operator needed to drop a car to a new space, what would he need to do for this to happen?

• A)Lift the electromagnet farther away from the pile of cars.

• B)Reverse the magnetic field by switching the poles of the core.

• C)Turn off the magnetic field by switching off the electric current.

• D)The magnetic field can be decreased by placing it close to another electromagnet.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

You and your classmates are experimenting with things that can affect the strength of an electromagnet. The data table records the number of paperclips picked up by an electromagnet with 50 coils of wire at differing voltages. What conclusion can you draw from your data? Hint: Be sure to read the table.

• A)The greater the voltage, the stronger the electromagnet.

• B)An electromagnet with 50 coils is much stronger than an electromagnet with less coils.

• C)An electromagnet with a voltage of 6V is twice as strong as an electromagnet with a voltage of 3V.

• D)An electromagnet with a voltage of 4.5V is three times as strong as an electromagnet with a voltage of 1.5V.

Tags

NGSS.MS-PS2-3

Sal and Marie were experimenting with bar magnets in science class, picking up chains of paper clips. Where should they expect the magnetic force of the bar magnet to be the strongest and pick up the most paper clips?

• A)at both Poles

• B)at the South Pole

• C)at the North Pole

• D)in the center of the bar magnet

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Braddy connected the loose wire to the battery and created an electromagnet. He picked up 45 thumb tacks with his electromagnet, though his goal was to pick up 50 thumb tacks. What could Braddy do to increase the strength of his electromagnet and pick up more thumbtacks?

• A)Use fewer coils of wire.

• B)Use a screw instead of a nail.

• C)Use two batteries instead of one.

• D)Replace the nail with a piece of steel.

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

NGSS.MS-PS2-3

If the bar magnet on the left were broken in half, what statement correctly predicts how the two halves of the magnet would react to the magnet on the right?

• A)Neither halves of the broken magnet would be attracted to the magnet on the right because a magnet must have two poles.

• B)The two halves of the broken magnet would be attracted to each other, but neither would be attracted to the magnet on the right.

• C)Only the right side of the broken magnet would be attracted to the magnet on the right since it contains the south-oriented magnetic domains.

• D)The right side of both halves would be attracted to the magnet on the right since the south pole of each half would be facing the north pole of the other magnet.

Tags

NGSS.MS-PS2-5

Which electromagnet would have the most strength?

• A)An electromagnet with 5 coils.

• B)An electromagnet with 10 coils.

• C)An electromagnet with 15 coils.

• D)An electromagnet with 20 coils.

Which statement about magnetic poles is accurate?

• A)Same magnetic poles attract, while different magnetic poles repel.

• B)Same magnetic poles attract, while different magnetic poles attract.

• C)Opposite magnetic poles attract, while like magnetic poles repel.

• D)Opposite magnetic poles repel, while like magnetic poles attract.

Tags

NGSS.MS-PS2-3