Chapter 10.2 Applications of Induced Currents

Electromagnetic induction happens when there is a change in ___________________.

• surface area

• magnetic poles

• magnetic flux

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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What would happen if I move a bar magnet in and out of a coil of copper wire?

• Electric current would disappear 
• The magnet would explode 
• Electric current will flow through the wire
• It would produce a gravitational field

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A magnet is moved in and out of a coil of wire connected to a high-resistance voltmeter. If the number of coils increases, the induced voltage

• decreases

• increases

• is the same

• halves

Which description best applies to Lenz's Law?

• An induced current occurs when a magnet passes through a tube.

• When a change in magnetic field occurs to a coil the direction of current goes in the in the other direction to this change.

• The direction of an induced current is such to align with the change that created it.

• A magnet is a tube is always slowed by its magnetic field.

Which activity will produce the highest current?

• Move the magnet bar into the coil while the coil remains stationery

• Move the coil into the magnet bar while the magnet remains stationery

• Move the coil and magnet towards each other

• Move the coil and magnet away from each other

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Which action will increase the deflection of the galvanometer pointer?

• The magnetic pole is reversed

• The number of turns of coils is increased

• The coil is made from insulated wire

• The magnet is slowly pushed into the coil

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In what direction is the magnet moving?

• Left
• Right
• Up
• Down

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In what direction is the magnet moving?

• Left
• Right
• Up
• Down

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When do we have self induction?

• When the magnet moves into the coil
• When the coil moves into the magnet
• When a constant current passes through the coil
• When a changing current passes through the coil

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