Magnetism

Tim and Sam build an electromagnet by wrapping a wire around a nail and connecting the wire to both terminals of a battery. When they test the electromagnet, it can pick up 6 paper clips. Their teacher wants all groups to pick up at least 10 paper clips. What could Tim and Sam do to increase the number of paper clips their electromagnet picks up?

• make the wire shorter

• remove the nail from the center of the wire

• increase the size of the iron core

• spread the loops of wire apart on the nail so they do not touch

Tags

NGSS.MS-ETS1-3

NGSS.MS-PS2-5

Which example below would produce an electric current?

• Connect a wire between a copper and zinc strip sitting in a beaker of water.

• Rotate a coil of copper wire in a magnetic field.

• Connect a wire to the (+) positive end of a battery and the other end to a light bulb.

• Connect a wire to the (-) negative end of a battery and the other end to a light bulb.

In most electric power plants, magnets are moved through a coil of wire. This causes current to flow through the wire. The device that does this is called a(n)

• electric amplifier

• series circuit

• electric generator

• electric motor

Suppose you connect a wire from the positive to negative terminal of a battery. Once this circuit is connected, all of the following items are put next to the wire. Which one of them moves?

• a compass needle

• a petri dish full of water

• small piece of aluminum foil

• a copper wire

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Which electromagnet would have the most strength?

• An electromagnet with 5 coils of wire.

• An electromagnet with 10 coils of wire.

• An electromagnet with 15 coils of wire.

• An electromagnet with 20 coils of wire.

Brady connected the lose 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 Brady do to increase the strength of his electromagnet and pick up more thumbtacks?

• Use fewer coils of wire.

• Use a screw that is the same size as the nail.

• Use a battery with more voltage.

• Replace the nail with a piece of copper.

Tags

NGSS.MS-ETS1-3

What did Hans Christian Oersted discover about electricity and magnetism?

• Magnetic domains exist

• the light bulb

• hydroelectric power is beneficial

• electric current produces a magnetic field

Tags

NGSS.MS-PS2-5

Electric generators turn _________ energy into _________ energy.

• electrical, mechanical

• mechanical, electrical

Electric motors turn __________ energy into _________ energy.

• Electrical, Mechanical

• Mechanical, Electrical

The picture is showing an example of a...

• Electric Generator

• Electric Motor

Tags

NGSS.MS-ETS1-1