Quiz about 24-25 Magnets & Electricity (non-contact forces) Test Review

Question 1

Examine the apparatus shown in the illustration below containing two circular magnets. Notice that magnet A is levitating above magnet B due to magnetic force. Which of the following statements correctly describes what is happening in this diagram?

Accepted Answer

C. The polarity at the top of magnet B is the same as the polarity at the bottom of magnet A.

Answer

A. The bottom of magnet A is a north pole, and the bottom of magnet B is also a north pole.

Answer

B. Neither of these circular magnets have poles. This explains why magnet A is levitating.

Question 2

Select the items that ALWAYS have an electric charge.

Accepted Answer

Electrons

Accepted Answer

Protons

Answer

Atoms

Answer

Neutrons

Answer

Conductors

Question 3

Which of the following actions can produce an electric current in a loop of wire?

Accepted Answer

moving a magnet up and down in a coil of wire

Answer

spinning the wire near a battery

Answer

placing a resistor at the end of the wire

Answer

heating a switch and placing it on the wire

Question 4

Which of these electromagnets would be able to lift more paper clips and why?

Accepted Answer

Example X would lift more, because it has more coils around the iron core.

Answer

Example W would lift more, because it has three batteries.

Answer

Example W would lift more, because it has less coils around the iron core.

Question 5

Which one of the images below shows electrical current being induced?

Accepted Answer

Image B

Answer

Image A

Answer

Image C

Question 6

Which of the following two statements about electromagnetism are correct?

Accepted Answer

A) A changing magnetic field can induce electric current.

Accepted Answer

B) An electric current can produce and magnetic field.

Answer

C) Electromagnetism has not been used in any practical way.

Answer

D) It is possible to make a magnet that has only a single, positive pole.

Answer

E) Electromagnetic induction was discovered in 2011.

Question 7

Examine the first image and determine if it is showing magnetic attraction or magnetic repulsion.

Accepted Answer

Attract

Answer

Repel

Question 8

Examine the second image and determine if it is showing magnetic attraction or magnetic repulsion.

Accepted Answer

Repel

Answer

Attract

Question 9

Examine the third image and determine if it is showing magnetic attraction or magnetic repulsion.

Accepted Answer

Repel

Answer

Attract

Question 10

Examine the fourth image and determine if it is showing magnetic attraction or magnetic repulsion.

Accepted Answer

Repel

Answer

Attract

Question 11

Which model shows electric field lines surrounding a positively charged object?

Accepted Answer

B

Answer

A

Answer

C

Answer

D

Question 12

Trevor and Jaxson used their knowledge of magnetic fields to design and build a hoverboard park. They embedded thousands of small electromagnets into the surface of the floor with the north poles facing up. What would the polarity of the bottom of the hoverboard have to be in order to levitate the board?

Accepted Answer

The bottom of the hoverboard would have to a north pole.

Accepted Answer

The bottom of the hoverboard would have to a south pole.

Answer

The hoverboard would not need any polarity as long as it was made of aluminum.

Answer

The hoverboard would not need any polarity as long as it was made of stainless steel.

Question 13

Trevor and Jaxson used their knowledge of magnetic fields to design and build a hoverboard park. They embedded thousands of small electromagnets into the surface of the floor with the north poles facing up. What would have to happen to make the hoverboard levitate higher off the floor?

Accepted Answer

The electromagnets would need more electrical current.

Answer

The electromagnets would need decreased electrical voltage.

Answer

The electromagnets would need increased electrical voltage.

Answer

The electromagnets would need less electrical current.

Question 14

Two bar magnets are being held 1 centimeter (cm) away from each other. When they are released, they move toward each other and connect. The magnets are then moved farther apart. Figure 1 shows the magnets held 1 cm away from each other and the same magnets held 3 cm away from each other. Show Mrs. TREAT you graph from the simulation.

Accepted Answer

The magnetic force decreases as the distance increases.

Answer

The magnetic force increases as the distance increases.

Answer

The magnetic force remains constant regardless of the distance.

Answer

The magnetic force is zero at all distances.

Question 15

What conclusion can be made about the seemingly artful arrangement of iron filings below?

Accepted Answer

The filings aligned with the magnetic field lines of a magnet.

Answer

It wasn't created by a magnet because magnetic field lines only act in two dimensions.

Answer

They weren't influenced by a magnet because magnets don't create fields.

Answer

They were skillfully arranged that way and glued together.

Question 16

Which of the following electromagnets would have the greatest magnetic field?

Accepted Answer

D

Answer

A

Answer

B

Answer

C

Question 17

If a positive test charge was placed in this electric field, where would you expect it to go? Drag and drop the best answer into the white box.

Accepted Answer

toward the negative charge along an electric field line

Answer

toward the negative charge

Answer

toward the positive charge

Answer

stay in place but start spinning

Question 18

Choose the statement that best summarizes the illustration.

Accepted Answer

Like charges repel

Accepted Answer

Opposite charges attract

Accepted Answer

Like charges repel and opposite charges attract

Answer

Electric charge does not create force

Question 19

READ: Two negatively charged particles that are brought close together will gain potential energy because like charges repel, and work must be done to overcome this repulsion and bring them closer.

QUESTION: When two negatively charged objects are brought closer together, the objects will ___________________.

Accepted Answer

gain energy

Answer

lose energy

Answer

energy level will stay the same

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