Electromagnetic Induction

The faster the magnet moves through the coil

• the stronger the induced current

• the weaker the induced current

• there is no change in the current

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Electromagnetic induction

• is the ability of an electric current to create an magnetic field AND the ability of a magnetic field to create an electric current.

• ability of magnets to create an electric field

• show that magnets have north and south poles and nothing more

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When an electric current runs through a wire, a magnetic field is induced…

• around the wire.

• parallel to the wire.

• under the wire.

• through the wire.

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In physics, to "induce" something is to:

• Make it more powerful

• Create it

• Turn it into something else

• Reverse its direction

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Current is produced in a conductor when it is moved through a ​ (a)   because the magnetic lines of force are applying a force on the ​ (b)   in the conductor and causing them to ​ (c)   . This process of generating current in a conductor by placing the conductor in a changing magnetic field is called ​ (d)   . There is no ​ (e)   between the conductor and the magnet. The current is said to be induced in the conductor by the magnetic field. The conductor, which is often a piece of wire, must be perpendicular to the magnetic lines of force in order to produce the maximum force on the free electrons. The direction that the induced current flows is determined by the direction of the lines of force and by the direction the wire is moving in the field.

• magnetic field

• free electrons

• move

• induction

• physical connection

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What is the relationship between electricity and magnetism? Choose the best answer.

• Electricity is a form of magnetism.

• Magnetism is a form of electricity.

• Electricity can be converted to magnetism and vice versa.

• They are not closely related at all.

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Electrical generators move ______ to create an electrical current.

• protons

• circuits

• magnets

• miniature farm animals

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Voltage can be induced in a wire by

• moving the wire near a magnet.

• moving a magnet near the wire.

• changing the current in a nearby wire.

• all of these

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Electromagnetic induction is change in ___________________.

• surface area

• magnetic poles

• magnetic flux

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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