Electromagnetism MCQ
The fundamental rule for the attraction and repulsion of magnets is that _________.
Answer
Correct Answer:
Like poles repel each other while opposite poles attract
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The source of a magnetic field is a moving _________.
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The magnetic field about earth takes a shape _________.
Answer
Correct Answer:
Similar to that of an interior bar magnet
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The force that acts on an electron traveling in a magnetic field is _________.
Answer
Correct Answer:
Perpendicular in direction to the magnetic field
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When a magnet is quickly pushed into a coil of wire connected to a circuit _________.
Answer
Correct Answer:
Work is needed to overcome a resistance to the push
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What ultimately transfers from one location to another in electromagnetic induction is _________.
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The magnetic field lines due to a straight, current-carrying wire are __________.
Answer
Correct Answer:
Circles around the wire.
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The magnetic field around a current-carrying conductor is _____.
Answer
Correct Answer:
Circular around the conductor
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The magnetic domains in a magnet produce a weaker magnet when the magnet is _______.
Answer
Correct Answer:
Either of these answers
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The greeks studied charges using _____.
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The greek letter s represents __________ in this chapter.
Answer
Correct Answer:
Surface charge density
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Large power plants in the united states use ____________________ generators
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In order that electromagnetic induction occurs in a circuit there must be a _________.
Answer
Correct Answer:
Change in magnetic field intensity
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If you change the magnetic field inside a closed loop of wire, you induce in the loop _______.
Answer
Correct Answer:
All of these
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According to your textbook, electric field lines are sometimes called __________.
Answer
Correct Answer:
Lines of force
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A primary difference between a motor and a generator is _________.
Answer
Correct Answer:
The reversed roles of input and output
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Radio waves have a ________ wavelength than visible light and are therefore ________ energetic.
Answer
Correct Answer:
Longer; less
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In an electromagnetic wave, the electric field and magnetic fields __________.
Answer
Correct Answer:
Always at 90 degrees phase difference
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The ___________ is a plane perpendicular to the optic axis through the focal point.
Answer
Correct Answer:
Focal plane
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Iron filings sprinkled near a magnet arrange themselves into a pattern that illustrates the _____.
Answer
Correct Answer:
Magnetic field
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Two parallel wires carry a current in the same direction. there is ___________ between the wires.
Answer
Correct Answer:
An attractive force
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Like charges ____________________ and opposite charges ____________________.(1 point)
Answer
Correct Answer:
Like = repel; opposite = attract
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In this video, we see that a _____ magnetic field can create an electric current.
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Earth's magnetic field does not affect ____
Answer
Correct Answer:
Other planets That's correct!
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When an iron rod is placed inside a current-carrying coil of wire _________.
Answer
Correct Answer:
The coil becomes a stronger electromagnet
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Compared with a simple galvanometer, an electric motor is _________.
Answer
Correct Answer:
Much the same with small modifications
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The field inside a charged parallel-plate capacitor is __________.
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The force that acts on a current-carrying wire placed in a magnetic field is _________.
Answer
Correct Answer:
Perpendicular in direction to the magnetic field
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The magnetic field about a straight length of current-carrying wire is _________.
Answer
Correct Answer:
Circular in shape
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The magnetism of a permanent magnet results from __________.
Answer
Correct Answer:
The magnetic moments of electrons in the material making up the magnet
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A step-up transformer in an electrical circuit can step up _______.
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A capacitor ________.
Answer
Correct Answer:
Stores electrons, passes AC, blocks DC
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A wire carrying a current is bent into a loop. the magnetic field is strongest _____.
Answer
Correct Answer:
Its center
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