Electric and Magnetic Forces

Students in Ms. James’ physical science built electromagnets using a 4.5 volt battery, a piece of #20 insulated wire, and an iron nail.

The students wrapped coils of wire around the nail, hooked the nail to the battery, and then recorded how many paper clips they could pick up using their electromagnet. They increased the coils of wire by five each time, beginning with 5 coils and ending with 20 coils. They ran 3 trials at each level and then calculated an average. Here is the data table with the data they collected

1. Which of the following statements would be correct based on the information in the data table above? 

• As the number of coils of wire increases, the number of trials should increase.

• The number of coils of wire does not affect the strength of the electromagnet.

• As the number of coils of wire increased, the strength of the electromagnet decreased

• As the number of coils of wire increased, the strength of the electromagnet increased.

 If a bar magnet is lying on a table in the following position, (south pole on left / north pole on right), which of the following positions of another magnet placed to the right of the magnet above would result in the two magnets attracting and moving towards each other?

• A magnet with the orientation - south pole / north pole

• A magnet with the orientation - north pole / south pole

• Both A and B would cause the magnets to be attracted to one another

• Neither A nor B would cause the magnets to be attracted to one another

Tags

NGSS.MS-PS2-3

Which one of the following statements about electric forces and magnetic forces is not true?

• Opposite charges attract each other

• As distance between charged particles / poles decreases the strength of the force increases.

• Like charges attract each other

• 1. As distance between charged particles / poles increases the strength of the force decreases.

Tags

NGSS.MS-PS2-3

Which of the following statements would work to increase the strength of the electromagnet beyond what the chart shows?

• Add an additional trial for each time the number of coils of wire increases.

• Increase the number of coils of wire around the iron nail.

• Decrease the number of coils of wire around the iron nail.

• Use a plastic nail instead of an iron nail.

Tags

NGSS.MS-PS2-3

Which one of the following would result in a stronger electromagnet?

• Decreasing the number of coils of wire around the iron core

• Substitute another metal for the iron core (nail).

• Increasing the voltage of the battery used.

• Reducing the number of batteries used

Tags

NGSS.MS-ETS1-1

Which path could be made by launching a positively charged particle (the line) past the fixed negatively (single dot) charged particle shown below?

• A

• B

• C

• D

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Select the one item below that electric force and magnetic force do not have in common.

• Opposite charges attract

• Distance between charged objects affects the strength of the force

• Magnetic force and electric force are both contact forces

• The strength of electric and magnetic forces can change based on certain factors

Tags

NGSS.MS-PS2-3

What will happen to the magnets on the left if they are released?

• The magnets will move toward each other.

• The magnets will move farther apart.

• The magnets will both move to the left.

• The magnets will both move to the right.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Using the information on the magnet chart on the left, which of the following would increase the strength of the magnetic force between the main magnet and Magnet B?

• Decreasing the size of the main magnet.

• Increasing the distance between the main magnet and Magnet B.

• Decreasing the size of Magnet B.

• Decreasing the distance between the main magnet and Magnet B.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Using the information on the magnet chart on the left, which of the following would decrease the strength of the magnetic force between the main magnet and Magnet A?

• Decreasing the size of the main magnet.

• Decreasing the distance between the main magnet and Magnet A.

• Increasing the size of Magnet A.

• Removing Magnet B.

Tags

NGSS.MS-PS2-5