Electromagnetic Induction Review

Surrounding every moving electron is 

• (a) a magnetic field
• (b) an electric field
• (c) both of these
• (d) none of these

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Which field can accelerate an electron, but never change its speed? 

• (a) Electric field
• (b) magnetic field
• (c) both of these 
• (d) neither of these

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When there is a change in the magnetic field in a closed loop of wire

• (a) a voltage is induced in the wire
• (b) current is made to flow in the loop of wire 
• (c) electromagnetic induction occurs
• (d) all of these

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Thrust a magnet into a coil of wire. While the magnet is being moved toward the coil 

• (a) becomes an electromagnet
• (b) has a current in it
• (c) both of these 
• (d) neither of these

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Voltage can be induced in a wire by

• a. moving the wire near a magnet.
• b. moving a magnet near the wire.
• c. changing the current in a nearby wire.
• d. all of these

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 If a magnet is pushed into a coil, voltage is induced across the coil. If the same magnet is pushed
into a coil with twice the number of loops,

• a. one-half as much voltage is induced.
• b. the same voltage is induced.
• c. twice as much voltage is induced.
• d. four times as much voltage is induced.

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What is the main difference between electric charges and magnetic poles?

• a. electric charges can be isolated, magnetic poles cannot be isolated
• b. electric charges cannot be isolated, magnetic poles can be isolated
• c. electric charges both attract and repel, magnetic poles only attract
• d. electric charges both attract and repel, magnetic poles only repel

 What condition is necessary for an electric charge to have a magnetic field around it?

• a. it must be in a copper wire
• b. it must be isolated from the opposite charge
• c. it must be moving
• d. it must be motionless

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 What does a moving charged particle experience if it moves through a static magnetic field?

• a. nothing
• b. an acceleration in the current direction
• c. a deflection that is parallel to the magnetic field
• e. a deflection that is perpendicular to both the magnetic field and the current

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Electromagnetic induction occurs in a coil when there is a change in

• a. electric field intensity in the coil.
• b. magnetic field intensity in the coil.
• c. voltage in the coil.
• d. the coil's polarity.

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