Which statement best explains how iron can become a magnet?
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Question 2
2.
Two parallel copper wires are each carrying the same electrical current in the same direction. Which statement explains how they respond to each other?
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Question 3
3.
The diagram below shows an object made from a battery, a nail, and some wire.
What will happen if you touch a metal paperclip to the nail?
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Question 4
4.
Which of the following electromagnets would have the greatest magnetic fi eld?
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Question 5
5.
The diagram below shows a bar magnet within a coil of conducting wire. The magnet is moved back and forth. The magnet never has contact with the wire.
As the magnet is moved, the wire will
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1
Question 6
6.
The diagram below shows current flow through a wire.
Which of the following represents the magnetic field resulting from the current?
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Question 7
7.
The diagram pictured shows a loop of wire being rotated at a constant rate about an axis in a uniform magnetic fi eld.
As the speed of rotation of the wire loop is increased, the maximum voltage induced in the loop
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Question 8
8.
What is the main advantage of using alternating current (AC) over direct current (DC) when transmitting electricity?
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Question 9
9.
The primary coil of a transformer has 400 turns; the secondary coil has 1,000 turns. An alternating current is sent through the primary coil. The voltage in the primary coil has an amplitude of 17 V. Which statement best describes the voltage amplitude in the secondary coil?
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Question 10
10.
The diagram shows a wire loop rotating between magnetic poles. During 360 degrees of rotation from the position shown, the induced voltage changes in