Question 1

In this picture, the iron filings show the shape of the magnetic

Accepted Answer

field.

Answer

core.

Answer

axis.

Answer

pole.

Question 2

Power cords are covered in rubber or plastic because

Accepted Answer

rubber and plastic are good insulators.

Answer

rubber and plastic are comfortable to hold.

Answer

rubber and plastic allow electrons to pass through easily.

Answer

rubber and plastic are good conductors.

Question 3

Why do the aluminum foil leaves separate when the charged object is touched to the top of the electroscope?

Accepted Answer

The electrons move from the charged body to the foil and the negative charges on the foil leaves repel each other.

Answer

The electrons move from the charged body to the foil and the positive charges on the foil repel each other.

Answer

The protons move from the charged body to the foil and the negative charges on the foil repel each other.

Answer

The electrons move from the charged body to the foil and the neutral charges on the foil repel each other.

Question 4

Which THREE items would you need in order to make an electromagnet?

Question 5

What type of charge distribution occurs as the can attracts to the balloon without touching?

Accepted Answer

induction

Answer

electric current

Answer

friction

Answer

conduction

Question 6

Select what describes electric motors.

Question 7

Select what describes electric generators.

Question 8

Which pair below will have the MOST gravity between them and why?

Accepted Answer

first picture

Answer

second picture

Answer

third picture

Answer

fourth picture

Question 9

Match examples with the method of charging.

Question 10

What does the diagram show?

Accepted Answer

the direction of the magnets force and the strength of the magnet

Answer

the force of gravity around the magnet

Answer

the strength of the electrical force of the magnet

Answer

the flow of air particles around the magnet

Question 11

A student suspends two neutral metal pith balls close together.

They bring a negatively charged rod near (but not touching) one pith.

Both pith balls move so the one nearer the rod becomes attract toward the rod and the other moves away slightly.

Which method explains how the pith balls became charged?

Accepted Answer

Induction. The near rod caused charge separation and grounding removed electrons, leaving positive charges on both.

Answer

Conduction. The rod touched the pith balls transferring electrons.

Answer

Friction. Rubbing between the materials produced the charge.

Answer

Contact polarization. Permanent alignment of charges within pith balls created the effect.

Question 12

Which electromagnet is the strongest?

Accepted Answer

An electromagnet with 6 wrapped coils around a nail with a 9-volt battery.

Answer

An electromagnet with 6 wrapped coils around a nail with a 3-volt battery.

Answer

All electromagnets are the same strength.

Answer

An electromagnet with the least coils wrapped around a nail with 3-volt battery.

Question 13

A student is exploring how a positively charged rubber rod influences the distribution of electric charges on two stainless steel spheres that are in contact. The diagram below illustrates two stages of the investigation.

Which diagram in step 2 shows the correct way the charges are distributed on the stainless-steel spheres?

Accepted Answer

https://uploads.quizalize.com/9b865494-e7f2-4146-a588-84ee8e0279e1/question/e2dfbb6ff7cbe9fa6ef279aa232dab200d1ababd.png

Answer

https://uploads.quizalize.com/9b865494-e7f2-4146-a588-84ee8e0279e1/question/a3b7fa7739b99677116f86f68daa3ed81671bf1f.png

Answer

https://uploads.quizalize.com/9b865494-e7f2-4146-a588-84ee8e0279e1/question/0629a0b66dea0ef91c8e7b153ff8fa127ce9e3dd.png

Answer

https://uploads.quizalize.com/9b865494-e7f2-4146-a588-84ee8e0279e1/question/834d7df39cb67fe3c1ccfe70333ee6c98f878164.png

Question 14

Students are planning and carrying out an investigation to demonstrate how to induce a charge on an insulator and its effect on another object. They write the following steps, but some steps are missing. What are the BEST steps to complete the investigation and explain the distribution of charges on the objects?

Accepted Answer

Step 1: After inflating the balloon, students rubbed the balloon against their hair.

Step 5: Students explained the balloon has a negative charge, and the positive side of the water molecules were attracted to the balloon

Answer

Step 1: After inflating the balloon, students rubbed the balloon along the metal part of the faucet.

Step 5: Students explained the balloon has a positive charge, and the negative side of the water molecules were attracted to the balloon.

Answer

Step 1: After inflating the balloon, students rubbed the balloon along the metal part of the faucet.

Step 5: Students explained the balloon and the water both have positive charges that repelled each other.

Answer

Step 1: After inflating the balloon, students rubbed the balloon against their hair.

Step 5: Students explained that the balloon and the water are both neutral (equal distribution of charges), and they attracted each other.

Question 15

A student is conducting an experiment using a made at home electroscope, shown in the picture.

The student first taped the two pieces of tape on the table and then pulled them very quickly and placed them on the tips of the straws.

The photograph shows what happened when the student moved the two containers with the straws closer together.

The student made the claim that the movement of the pieces of tape is the result of a force acting on them.

Construct an argument using evidence to support the claim.

Accepted Answer

The two pieces of tape move the way they do because as a result of pulling the two pieces of tape from the table very quickly they acquire an electrical charge that creates a repulsive force between them when put in close contact.

Answer

The two pieces of tape move the way they do because there is an unbalance force to the force of gravity causing them to move apart from each other as they are moved closer together.

Answer

The two pieces of tape move the way they do because the gravitational force between the two objects is causing them to move apart from each other as they get closer.

Answer

The two pieces of tape move the way they do because as a result of Newton’s Law of Inertia each piece of tape continue to stay in their initial state before they were pushed towards each other.

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