An invisible force that attracts electrically charged particles

What happens when a wire is wound into a coil around an iron core in an electromagnet?

the magnetic field becomes stronger

the magnetic field becomes weaker

What would increase the strength of an electromagnet?

Increasing the amount of current flowing through the wire.

Inserting a wooden core inside the coil

Changing the direction of the current

Decreasing the number of coils of wire

What would happen if you broke a magnet in half?

You would have two new pieces which would have a north and south pole

Neither pole would be magnetic anymore

You would have two magnets, one with only a north pole and the other with only a south pole

The strength of the magnetic field of a electromagnet can be increased by

Decreasing the number of coils.

What will happen when these magnets are brought close together?

Both magnets will turn to the left

Both magnets will turn to the right

Which of the following is true of a bar magnet?

It is surrounded by a magnetic field.

Its magnetic field is strongest near its center.

The north pole is stronger than the south pole.

The south pole is stronger than the north pole.

What happens when a wire is wound into a coil around an iron core in an electromagnet?

the magnetic field becomes stronger

the magnetic field becomes weaker

Which description best applies to Lenz's Law?

When a change in magnetic field occurs to a coil the direction of current goes in the in the other direction to this change.

An induced current occurs when a magnet passes through a tube.

The direction of an induced current is such to align with the change that created it.

A magnet is a tube is always slowed by its magnetic field.

Which activity will produce the highest current?

Move the coil and magnet towards each other

Move the magnet bar into the coil while the coil remains stationery

Move the coil into the magnet bar while the magnet remains stationery

Move the coil and magnet away from each other

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

Add more coils around the paper cylinder

What is one way to increase the current in a wire?

Take the wire off of the magnet

How could the experimenter increase the amount of electricity being induced by this experiment?

Nothing, the amount of electricity cannot be increased

What benefit is gained by the addition of the iron core in an electromagnet?

It makes a weak magnet stronger

It makes a strong magnet weaker

It lets currents interact with each other

13.7 Based on this picture, which side will have a higher voltage?

Both sides have the same voltage

F5 Chp3.1: Electromagnet

Authored by han guan ng

Physics

KG - 12th Grade

NGSS covered

Used 91+ times

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50 questions

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is an electromagnet?

a temporary magnet made from current carrying wire around a magnetic metal core.

a permanent magnet with a north and south pole

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What makes an electromagnet stronger?

Increase the number of wire wraps around the iron core

decrease the strength of the power source

remove the source of current

lightning bolts hitting a tree

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the relationship between electrical current and magnetic field strength in an electromagnet?

When current is increased, magnetic field strength increases

When current is increased the strength of magnetic field decreases

MULTIPLE CHOICE QUESTION

1 min • 1 pt

This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

Add more coils of wire to the nail.

Use a smaller battery.

Reverse the poles of the magnet.

Remove all the coils and the nail.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following is NOT part of an electromagnet?

Wire

Iron

Toothpick

Power source

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following is shown in the picture?

Electromagnet

Electric generator

Electric motor

Transformer

MULTIPLE CHOICE QUESTION

1 min • 1 pt

How are electromagnets different from magnets?

magnets can be turned on/off

you can turn an electromagnet on/off

magnets are more powerful

magnets have a North and South pole

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F5 Chp3.1: Electromagnet

What is an electromagnet?

What makes an electromagnet stronger?

What is the relationship between electrical current and magnetic field strength in an electromagnet?

This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

Which of the following is NOT part of an electromagnet?

Which of the following is shown in the picture?

How are electromagnets different from magnets?

What is magnetism?

What are the ends of a magnet called?

What is the name of the force that attracts or repels materials?

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