Electromagnetism MS PS 2-3

Select all of the factors that affect the strength of an electromagnet.

• number of times the wire is looped around the core

• size of the object being attracted by the core

• amount of material in the core

• type of material in the core

• voltage of the battery

Tags

NGSS.MS-PS2-3

Which change would increase the magnetic force between these magnets?

• moving the magnets closer together

• placing a piece of glass between the magnets

• moving the magnets farther apart

• placing a sheet of steel between the magnets

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Three point charges are configured as shown below. Which statement explains the interactions of these charges?

• X exerts a force on Y to the left; Z exerts a force on Y to the right.

• X exerts a force on Y to the right; Z exerts a force on Y to the left.

• X exerts a force on Y to the left; Z exerts a force on Y to the left.

• X exerts a force on Y to the right; Z exerts a force on Y to the right.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

In this prototype of a flashlight, a neodymium magnet (Y) is shaken back and forth through a circular copper coil (X), producing an electric current to operate the flashlight for several minutes at a time. What do the magnet and copper coil in this flashlight represent?

• generator

• motor

• resistor

• transformer

Tags

NGSS.MS-PS3-5

A student creates four models to show the forces between charged particles. Which question is the student trying to answer with the models?

• How does distance affect the magnetic force?

• How do distance and charge affect the magnetic force?

• How does charge affect the electric force?

• How do charge and direction affect the electric force?

Tags

NGSS.MS-PS2-3

Students made an electromagnet by wrapping a copper wire around a steel rod and then attaching the ends of the wire to a battery. Using different configurations, they counted the number of paper clips that the electromagnet picked up. They obtained the data shown in the table.

• The magnetic field produced is inversely proportional to the length of the wire.

• The electric field produced is directly proportional to the length of the wire.

• The electric field produced is inversely proportional to the number of coils.

• The magnetic field produced is directly proportional to the number of coils.

Would increasing the number of batteries in a circuit that is connected to a small electric motor affect the speed of the motor, if all other variables are kept constant?

• No, because it is the magnetic force, not the electric force, that controls the motor speed.

• Yes, the motor would run faster because the increased electrical force increases the magnetic force in the motor.

• No, the speed of a motor is controlled only by the number of wire coils in the motor.

• Yes, the motor would run faster because increased current causes the motor to become warmer.

Jenna has a cupboard with a door held shut by a magnet on the doorframe and a steel plate on the door. Jenna’s cat can open the door. How can Jenna increase the strength of the magnetic force holding the door so that her cat cannot open it?

• Replace the steel plate with a copper plate so a stronger force forms.

• Add a second steel plate to the door so that both plates touch the magnet.

• Add a second magnet to the door frame so that both magnets touch the steel plate.

• Reverse the direction of the magnet so that the opposite pole touches the plate.

Tags

NGSS.MS-ETS1-2

NGSS.MS-PS2-5

Using the theory of magnetic domains, which of the following correctly describes the characteristics of the magnetic domains of the three materials below?

• X is a magnetic material with domains that are not lined up; Y is a magnetic material with domains that are not lined up; Z is a magnet with all domains aligned.

• X is a non-magnetic material with no domains; Y is a magnetic material with domains that are not lined up; Z is a magnet with all domains aligned.

• X is a non-magnetic material with no domains; Y is a non-magnetic material with domains that are not lined up; Z is a non-magnetic material with all domains aligned.

• X is a magnetic material with domains that are not lined up; Y is a magnetic material with domains that are not lined up; Z is a non-magnetic material with no domains.

Tags

NGSS.MS-PS2-3

Anna notices that different types of clothing stick together when they are dried in an electric dryer. When the clothes are pulled apart, they make sparks and a crackling sound due to electric forces of attraction. How can Anna reduce the amount the clothing clings together in the dryer?

• Add a substance to the wash that reduces the number of charges transferred.

• Increase the temperature of the air in the dryer to weaken the electric forces.

• Dry more clothes at the same time so that there is less room for electric forces.

• Change the charges on the clothes by running the dryer at a faster speed.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5