S8P5 GMAS Review - Electromagnetism Review

Which change would result in a stronger electromagnet?

• Reducing the number of batteries

• Increasing the voltage of the battery

• Substituting another metal for the iron core

• Decreasing the number of coils around the iron core.

Which change would result in a stronger electromagnet?

• using a smaller battery

• using an iron nail with a larger diameter

• changing the core to something made of aluminum

• decreasing the number of wire coils around the nail

Tags

NGSS.MS-PS2-3

Attached is a picture of an electromagnet. Magnets and electromagnets can both be used to pick up metal items like iron nails. Although they are alike, there is a difference between magnets and electromagnets. An example of this is that increasing the current running through the electromagnet's wire will make it stronger. What is another difference?

• Increasing the amount of wire loops will increase the strength of an electromagnet.

• Increasing the amount of wire loops will increase the strength of a magnet.

• There is no other difference between electromagnets and magnets.

• Electromagnets are always stronger than regular magnets.

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NGSS.MS-PS2-3

Donna is trying to make an electromagnet to pick up old nails around her driveway. Which of these materials would be best to use for the core in order to make the strongest electromagnet to pick up the most nails?

• iron nail

• wooden stake

• plastic ruler

• cardboard tube

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NGSS.MS-ETS1-1

Jake has four pairs of horseshoe magnets in different sizes. They are all made of the same material and have the same shape. He experiments by moving each pair farther and farther apart. Which pair of magnets will attract each other at the farthest distance?

• the largest pair of magnets

• the smallest pair of magnets

• the third largest pair of magnets

• the magnets all have the same amount of attraction

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NGSS.3-PS2-3

During induction, a positively charged rod is brought near to but not touching the electroscope. The presence of the positively charged object above the plate of the electroscope induces negative charges to move towards the electroscope, leaving the leaves with an overall positive charge. The positive leaves repel. The same process occurs when the north poles of two magnets are brought close together: the two poles push away from each other. Both illustrate the principle that

• like charges or poles repel.

• induction produces magnetism.

• electricity induces magnetism.

• opposite charges or poles repel.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Mike wants to negatively charge a small rubber ball. Which of these methods would successfully charge the ball?

• heating the ball in boiling water

• running the ball over a strong magnet

• rubbing the ball back and forth on carpet

• dropping the ball from a tall building

Tags

NGSS.MS-PS2-3

Static charges can be applied to neutral objects by friction, induction or conduction. What do all of these methods utilize to create this charge?

• protons

• electrons

• heat energy

• magnetic domains

A student is investigating how a negatively charged rubber rod affects charges distributed on two positively charged steel spheres that are in contact, as shown in the diagram below.

Which process will occur between the rubber rod and the sphere it is placed near?

• Conduction, because they are not touching.

• 
  Induction, because they are not touching.

• Friction, because one material is being rubbed on another.

• Insulation, because the spheres are touching.

Tags

NGSS.MS-PS2-3

There are three ways to give an object a static charge. They are friction, conduction and induction. A student states she has two charged objects. She states that one was charged by the other by induction. What observation would support that statement?

• The two objects repel each other.

• The two objects have the same charge.

• The two objects are oppositely charged.

• The force between the objects decreases as they get closer to each other.

Tags

NGSS.MS-PS2-5