In an electromagnet, coils of wire are wrapped around a magnetic object to generate a magnetic field. What the is relationship between number of coils and the strength of the magnetic field?

The more coils an electromagnetic has, the stronger the magnetic field

The more coils an electromagntic has, the weaker the magnetic field

The larger the metal object, the stronger the magnetic field is

There is no relationship between number of coils and the strength of a magnetic field

To decrease the strength of a magnetic field around an electromagnet, we must

increase the size of the iron core

decrease the size of the iron core

Students rubbed a balloon across a square carpet to give it an electrical charge. They found the charged balloon could pick up pieces of paper. What data could they collect to decide if the electric charge is getting stronger?

The number of pieces the paper picked up

The length and width of the balloon

The size of the piece of carpet

The distance the balloon was rubbed

Students attached both ends of a long wire to the poles of a battery and wrapped the wire around a spoon. In this arrangement, the spoon is able to pick up five paper clips. The students wrap more wire around the spoon and want to determine if the strength of the magnetic force has increased. Which of the following observations would indicate that wrapping more wire has increased the strength of the electromagnet?

The spoon now picks up seven paper clips.

The ends of the wire must touch the battery terminals.

Eventually, the battery runs out of energy.

More wire was needed to wrap around the spoon.

Which of the two below result in an attractive force?

A positive charge and a negative charge

What is the primary difference between electric and magnetic forces?

Electric forces act between charged particles, while magnetic forces act between magnetic poles.

Electric forces require a medium to act, while magnetic forces do not.

Electric forces are always attractive, while magnetic forces are always repulsive.

Electric forces are stronger than magnetic forces in all situations.

In an experiment, a student observes that a compass needle deflects when placed near a current-carrying wire. What scientific principle does this demonstrate?

Magnetic fields are created by moving electric charges.

Electric fields can influence magnetic materials.

Electric charges are attracted to magnetic poles.

Magnetic poles can create electric charges.

Which of the following best describes the relationship between electricity and magnetism in the context of electromagnetic induction?

A changing magnetic field creates an electric field.

A changing electric field creates a magnetic field.

A static electric field creates a magnetic field.

A static magnetic field creates an electric field.

Electrical and Magnetic Forces

Authored by Lisa Thompson

Science

8th Grade

NGSS covered

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MULTIPLE SELECT QUESTION

1 min • 1 pt

How could I increase the strength of my electromagnet?

More Batteries

Smaller paper clips

More loops of copper wire

Larger Nail

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Atoms That have a positive charge will be attracted to atoms with a ______________ charge.

positive

negative

no charge

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What forces works only by combining electric and magnetic forces?

electric

magnetic

static electricity

electromagnet

MULTIPLE CHOICE QUESTION

1 min • 1 pt

This force occurs when there is an attractive and repulsive force between two poles.

Electric

Electromagnetism

Magnetism

Static Electricity

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What type of force is holding this balloon to the wall?

Applied

Gravitational

Magnetic

Electrical

In a magnet the opposite poles will

Attract

Repel

Neither

Like poles will

Attract

Repel

Neither

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Electrical and Magnetic Forces

How could I increase the strength of my electromagnet?

Atoms That have a positive charge will be attracted to atoms with a ______________ charge.

What forces works only by combining electric and magnetic forces?

This force occurs when there is an attractive and repulsive force between two poles.

What type of force is holding this balloon to the wall?

In a magnet the opposite poles will

Like poles will

The magnetic field of a magnet is ____________ further away from the magnet.

Electric charges that do not move through a current are known as

When electrons flow through wires from a - terminal to a + terminal a/an ___________ is created.

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