Read the passage about Diego’s experiment:

Question

Diego wants to make an electromagnet for the science fair. He only has a nail, copper wire, and a 9-volt battery. His experiment is to make a magnet strong enough to pick up paper clips. He wants to prove that his magnet can pick up the most clips.


What can Diego do to his magnet to make sure he picks up the most paper clips?

options:

Diego can wrap a few coils of the wire, far apart, around the nail.
Diego can wrap a few coils of the wire, far apart, around the nail.

Diego can wrap many coils of the wire, far apart, around the nail.
Diego can wrap many coils of the wire, far apart, around the nail.

Diego can wrap a few coils of the wire, close together, around the nail.
Diego can wrap a few coils of the wire, close together, around the nail.

Diego can wrap many coils of the wire, close together, around the nail.

Answer 1

To ensure that Diego's electromagnet can pick up the most paper clips, he should choose the option that maximizes the strength of the magnetic field generated by the current flowing through the wire. The best choice would be:

Diego can wrap many coils of the wire, close together, around the nail.

Wrapping more coils and placing them close together creates a stronger magnetic field, which will enhance the electromagnet's ability to attract and hold more paper clips.

Answer 2

Kennedy has two magnets. She would like to determine how much magnetic energy is stored in each one. What would be the best way for her to determine which magnet has the most magnetic energy?

options:

Attach wires to the ends of each magnet and measure the flow of electricity going through the wires.
Attach wires to the ends of each magnet and measure the flow of electricity going through the wires.

Put each magnet into a beaker of water to see how much water it displaces.
Put each magnet into a beaker of water to see how much water it displaces.

Measure how close each magnet can get to a metal object before picking it up.
Measure how close each magnet can get to a metal object before picking it up.

Record the weight of each magnet by measuring it on a balance scale.

Answer 3

To determine which magnet has the most magnetic energy, the best option for Kennedy is:

Measure how close each magnet can get to a metal object before picking it up.

This method will give her an indication of the strength of each magnet's magnetic field, as a stronger magnet will be able to attract metal objects from a greater distance. The other options do not specifically measure the magnetic energy or strength of the magnets effectively.

Answer 4

Calvin touches a negatively charged rod to a neutral metal sphere located on an insulated stand. What will happen to the electrons when the negatively charged rod touches the metal sphere?

options:

electrons will move from the sphere to the rod
electrons will move from the sphere to the rod

electrons will move from the rod to the sphere and spread out
electrons will move from the rod to the sphere and spread out

electrons will move from the rod to the sphere but stay close together
electrons will move from the rod to the sphere but stay close together

electrons will move from the sphere to the rod and stay close together

Answer 5

When Calvin touches a negatively charged rod to a neutral metal sphere, the correct outcome is:

Electrons will move from the rod to the sphere and spread out.

The negatively charged rod has an excess of electrons, and when it touches the neutral metal sphere, the excess electrons will transfer to the sphere. Since the sphere is a conductor, the electrons will spread out over its surface, causing the sphere to acquire a negative charge.