A fundamental property of matter that leads to electromagnetic interactions between particles is
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2.
Which of the following particles are found in the nucleus? Choose all that apply.
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3.
An atom with an overall charge is called a(n) _____.
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4.
An atom with the same number of protons and electrons is neutral (has no overall charge).
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5.
The strength of the electric force between two charged objects is determined by the amount of charge on each object and ______.
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6.
Like charges attract.
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7.
Atoms can become charged when they gain or lose ____.
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8.
The balloon has become negatively charged by rubbing it on the sweater. This is an example of redistribution of charge by what method?
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9.
The charged rod is brought near the top of the electroscope, which becomes positively charged by
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10.
Which of the following statements best explains why the top of the electroscope becomes positively charged when the charged rod is brought near it?
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11.
In the picture above, if the balloon is negatively charged, what is the charge on the girl's hair?
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12.
The buildup of electric charge on an object is called
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13.
The loss of built-up charges from an object is called
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14.
Lightning is an example of electric discharge.
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15.
The ancient Greeks are said to have discovered a naturally occuring magnetic material in the Earth that they called _____.
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16.
Which of the following elements is not ferromagnetic?
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17.
The ends of a magnet are called _______.
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18.
The magnetic force of a magnet is weakest near the _____.
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19.
The area surrounding a magnet where the magnetic force can be detected is called the _______.
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20.
Field lines around a magnet always leave the ______ pole and enter the ______ pole.
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21.
Where field lines are far apart, the magnetic force is ________.
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22.
The strength of the magnetic force that acts between two magnets depends on _____. Choose all that apply.
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23.
The mystery object in the picture above is a magnet. Based on the field lines shown, these two magnets will _____.
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24.
Based on the field lines in the picture above, the ends of the mystery magnets facing each other must be ______.
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25.
_______ can be sprinkled on a clear sheet of plastic that covers a magnet to help us “see” the invisible field lines around a magnet.
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26.
A domain is a region within a material in which a group of atoms have the same ________.
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27.
A piece of plastic can be turned into a temporary magnet by using a strong magnet to align its domains.
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28.
If you were to break a bar magnet in half, you would be left with _____.
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29.
Banging or dropping a temporary magnet can cause it to lose or weaken its magnetic field.
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30.
An electromagnet is a _______ wrapped in electrical wire that is connected to a power source.
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31.
The image on the left shows a ferromagnetic material. The object on the right shows what happens to that ferromagnetic materials when in the presence of a strong magnet.
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32.
Scientists believe that the Earth's magnetic field is caused by charged particles that swirl around inside Earth's _____.
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33.
Your friend, Billy, attaches a magnet to a string and allows it to hang freely. He discoves that the north pole of that magnet always turns and points toward the north pole of Earth. Billy turns to you and says, "I thought like poles repel! Why is the north side of my magnet pointing north?!" Explain to Billy what is happening and why he, and probably many other people, are confused by this phenomenon.
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34.
Auroras are created when ______ from the sun is/are guided by Earth's magnetic field.
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35.
An aurora is a beautiful display of light that can only be seen near the north pole.
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36.
The interaction between electricity and magnetism is called _____.
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37.
What kind of device is shown in the picture above?
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38.
List three changes you could make to the above device that would increase the strength of the magnetic field around the nail.
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39.
What do we call a coil of wire that carries an electric current?
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40.
A device that measures the strength and direction of an electric current is a _____.
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41.
Hans Oersted discovered that when a current flows through a wire, a(n) _____ is created around the wire.
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42.
In the first image, the circuit is open. In the second image, Oersted closes the circuit. If Oersted were to reverse the direction of the current flowing through the wire, the red compass needle would move toward the _____.
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43.
Which of the following are advantages that electromagnets have over permanent magnets? Choose all that apply.
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44.
The process of using a magnetic field to create an electric current in a wire is called _____.
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45.
Which of the following would reverse the current in the wire? Choose all that apply.
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46.
In the diagram of the generator above, a crank can be used to turn the coil of wire within the magnets. In power plants, instead of a crank, a turbine is used to turn the coil of wire within the magnets. Which of the following are used to turn the turbine in power plant generators? Choose all that apply.
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47.
A generator, like the one pictured above, converts...