Mod K Unit 2 Lesson 3 Quiz Review

A small bar magnet is shown. A compass is placed beside the magnet so that the center of the compass is next to the center of the magnet Which of these is true?

• The north pole of the compass needle points EXACTLY at the magnet's south pole

• The south pole of the compass needle points EXACTLY at the magnet's north pole

• The north pole of the compass points in the SAME DIRECTION as the magnet's south pole.

• The north pole of the compass needle points in the SAME DIRECTION as the magnet's north pole

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Two plastic balls are 5 cm apart. One is negatively charged, and the other is positively charged. A small magnet is placed between the two balls but is not touching either of them. The plastic balls remain stationary. Which statement describes the electric and magnetic fields?

• There is a magnetic field due to the magnet and no electric field

• There is a magnetic field between the two balls and no electric field

• There is an electric field between the two balls and no magnetic field

• There is an electric field around each ball and a magnetic field due to the magnet.

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Where is the magnetic force the weakest?

• position A

• position b

• position c

• position d

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A positively charged balloon is hanging from a string. A negatively charged rod is then held a short distance away. How will the balloon be affected?

• It will not be affected because only the rod has an electric field

• The fields on the balloon and the rod will interact causing the attractive force

• The fields on the balloon and the rod will interact causing a repulsive force

• It will not be affected because the balloon and the rod are not touching

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Which of these best describes an electric field?

• a measure of the length of an electrode

• the force that pushes two electrodes away from each other

• an invisible region that surrounds the positive charge

• a region around electric charges in which electric forces can affect charged objects

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Stephan claims that Earth has both a gravitational field and a magnetic field. Which statement best supports his claims?

• Any object will fall to the ground

• A bar magnet will fall to the ground

• Any object will fall to the ground and a compass can be used for navigation.

• A compass points in the direction of both the magnetic and gravitational fields

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A student is rubbing balloons on her hair. As the balloon is brought near her head, the hair seems to reach toward the balloon. Which of the following is the best explantation?

• Two Electric Fields are interacting

• two magnetic fields are interacting

• two gravitational fields are interacting

• two electromagnetic fields are interacting

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A student sprinkles iron filings around a magnet. What will she witness in this experiment? 

Answer explanation

She/He will see the magnetic field lines. They connect at the poles, which is where they are the strongest since the field lines get closer together and more dense.

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Two charged objects are 17 cm apart. One is positively charged, and the other is negatively charged. 

Describe the direction of electric field lines and any forces that would exist between the two balls.

Answer explanation

The electric field lines start at the positive and point to the negative charge. IF they are opposite they attract each other and connect. If they are like, they repel and don't connect to each other.

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The model shows the magnetic field lines of object A. The first diagram represents the magnetic field of object A before object B is moved into place. The second diagram represents the magnetic field of object A when object B is held in place next to object A. 

Why is object B a magnet and not a piece of iron? How do the field lines tell us this?

Answer explanation

Object B is a magnet because it is pushing the field lines away. Another word for "push away" is repelling. Since the field is repelling instead of attracting, we know it is a magnet instead of a piece of iron which would be attracted and the lines would move toward object b

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