Magnetic and Electric Fields Assessment - ELL MOD

The diagram shows the magnetic field surrounding a magnet. Where is the magnetic force the strongest?

• Position A
• Position B
• Position C

When Bethany walks across a carpet, her socks pick up many electric charges. Later in the day, these charges are no longer present on her socks. What most likely happened to the charges?

• The charges DISAPPEARED.
• The charges SWITCHED SIGNS
• The charges TRANSFERRED to another object.

The diagram shows two pairs of charged objects. Objects A and B are interacting with each other, and objects C and D are interacting with each other. Based on the diagrams, which statement is true?

• The electric force between A and B is SMALLER than the electric force between C and D.
• The electric force between A and B is BIGGER than the electric force between C and D.
• The electric force between A and B is THE SAME in magnitude (size) to the electric force between C and D.

What happens to the charges when a PVC rod is rubbed with a piece of fur or wool, giving the rod an overall negative charge?

• Negative charges are MOVED from the rod to the fur.
• Negative charges are MOVED from the fur to the rod.
• Negative charges are ADDED to the rod, and the fur remains neutral.

Jesse tests three magnets by observing how many paper clips he can attach to the north pole in a single chain. He warms the magnets in the oven for a few minutes and repeats his procedure. The data is shown in the table. Which statement BEST explains Jesse’s observations?

• The forces produced by a magnet naturally become weaker over time.
• Warming a magnet causes the magnetic force to decrease.
• The poles of the magnet become reversed when warmed and cause it to repel the paper clips

The diagram shows a balloon that was rubbed with a piece of cloth. Which statement describes the charges shown?

• Negative charges from the cloth were TRANSFERRED to the balloon.
• Balloons ALWAYS have more negative charges than positive charges.
• Some of the positive charges on the balloon DISAPPEARED when it was rubbed by the cloth.

The picture shows two magnets interacting with uncharged iron filings. What relationship is shown in the picture?

• Magnetic force between like ends is ATTRACTIVE.
• Electric force between opposite ends is ATTRACTIVE.
• Magnetic force between opposite ends is ATTRACTIVE.

Rohit is using a compass to investigate magnetic forces. Which of these will cause the compass to change direction?

• plastic paper clips
• a wooden doorknob
• the wire he is currently using to charge a cell phone

The distance between a positively charged object and a negatively charged object INCREASES. If everything else remains constant, what happens to the electric force between the objects?

• the electric force INCREASES
• the electric force remains THE SAME
• the electric force DECREASES

Based on the field diagram, what are these charges doing?

• Attracting
• Repelling
• No interaction