What happens when two north poles of a magnet are placed together?

the strength of the magnet is doubled

What option best describes this field?

An electric field generated by two opposite charges. They would attract each other.

An electric field generated by two positive charges. They would attract each other.

An electric field generated by two negative charge which would attract each other.

There is no force field present.

To increase the strength of an electromagnet you should

Increase the voltage of the battery

How are electromagnets different from magnets?

you can turn an electromagnet on/off

magnets have a North and South pole

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

Add more coils of wire to the nail.

Reverse the poles of the magnet.

Remove all the coils and the nail.

3) Gravity on the moon is about 1/6th the gravity felt on the earth. This is because

the moon is much less massive than the earth.

the moon is so far away from the earth.

the earth has a molten core and the moon doesn't.

the moon is so much further from the sun than the earth.

Jacob floated a long steel sewing needle on a small piece of cork in a glass of water. He noticed that as he turned the glass around, the cork and needle continued to point toward his backyard. Even after he turned the small floating cork around gently, the needle finally pointed toward the backyard. What is the MOST LIKELY conclusion Jacob will draw?

Jacob’s backyard is on the north side of his house.

There is a large magnet in the backyard.

The backyard is downhill from where Jacob is standing.

A gentle breeze is causing the needle to point toward the backyard.

The force of repulsion between two like-charged particles will increase if

the distance between the charged particles is decreased.

the distance between the charged particles is increased.

the magnitude of the charge on both the particles is decreased.

the magnitude of the charge on one of the particles is decreased.

When a student combed his dry hair for a long time, his hair began to stand up. Which of these has MOST LIKELY happened?

The comb and hair have become charged with opposite charges.

The comb and hair have become charged with similar charges.

The comb has become charged, but the hair has remained neutral.

The hair has become charged, but the comb has remained neutral.

Ms Jo Jo rubbed two balloons with a piece of wool. What will happen when the balloons are brought near each other?

The balloons will repel each other.

The balloons will attract each other.

The balloons will become positively (+) charged.

How do electrons differ from protons?

Electrons hold a negative charge and protons hold a positive charge.

Electrons are positively charged and protons are negatively charged.

Magnetic and Electric Forces

Authored by Charles Martinez

Physics

8th Grade

NGSS covered

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25 questions

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MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Joe has an idea to cut a bar magnet in half so that he can have one magnet with a north pole and one magnet with a south pole. What is wrong with this idea?

It is impossible to cut a magnet in half.

It is impossible to create an extremely small magnet.

It is impossible to create a magnet with only one magnetic pole.

It is impossible to separate two opposite magnetic poles once they are in contact with each other.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Where is the magnetic force the strongest?

Position A

Position B

Position C

Position D

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Magnetic field lines that curve away from each other show __________.

Repulsion

Attraction

A magnetic domain

Where the magnetic field is strongest

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The force of gravity on the surface of the Moon is about one-sixth the force of gravity on the surface of Earth. Which describes the relationship of mass and weight of an object on the Moon compared to that on Earth?

Both mass and weight are greater on the Moon.

Both mass and weight are less on the Moon.

Mass is the same, but weight is less on the Moon.

Weight is the same, but mass is less on the Moon.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A soft metal core that becomes magnetic when an electric current passes through coils around the core

Magnet

Electromagnet

Electricity

Copper Wire

Tags

NGSS.MS-PS2-5

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which statement is true about magnetic forces?

Distance does not affect the strength of the force field

The charge of the magnet affects the strength of the force field.

There is an east pole and west pole to every magnet

Distance and the strength of the magnet affect the strength of the force field

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Distance and mass are two factors that affect

Gravitational Force Fields

Magnetic Force Fields

Electric Force Fields

Electrostatic Force Fields

Tags

NGSS.MS-PS2-4

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Magnetic and Electric Forces

Joe has an idea to cut a bar magnet in half so that he can have one magnet with a north pole and one magnet with a south pole. What is wrong with this idea?

Where is the magnetic force the strongest?

Magnetic field lines that curve away from each other show __________.

The force of gravity on the surface of the Moon is about one-sixth the force of gravity on the surface of Earth. Which describes the relationship of mass and weight of an object on the Moon compared to that on Earth?

A soft metal core that becomes magnetic when an electric current passes through coils around the core

Which statement is true about magnetic forces?

Distance and mass are two factors that affect

What happens when two north poles of a magnet are placed together?

What option best describes this field?

Which is a factor that affects the strength of gravitational, magnetic, and electrostatic force fields?

Access all questions and much more by creating a free account

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