Magnetic Forces and Electromagnetism

An area where magnetic materials are attracted or repelled by the magnet.

• corn field

• magnetic field

• electromagnetic

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What tells us how strong a magnet is?

• magnetic strength

• charged particle

• magnetic field

• current

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This results from an interaction between electrically charged particles.

• charged particle

• repel

• electromagnetic force

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A form of energy available through a conductor

• electromagnetic

• magnetic charge

• electric charge

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matter with a surplus or deficiency of electrons

• electric charge

• charged object

• electromagnetic

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The flow of electric charge through an object

• electromagnetic force

• shocking

• current

A particle with either a positive or negative charge

• magnetic strength

• charged particle

• attraction

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Frederick sets paper clips out on a table. He then takes a magnet, places it directly beneath the paper clips under the table, and moves the magnet. He finds that the paper clips move with the magnet. Why does this happen?

• Magnetic force is a repellant force

• Magnetic forces act on wood, like in the table

• The paper clips are feeling the gravitational force of the magnet

• Magnetic forces act at a distance, even betwewn objects

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In an electromagnet, coils of wire are wrapped around a magnetic object to generate a magnetic field. What the is relationship between number of coils and the strength of the magnetic field?

• The more coils an electromagntic has, the stronger the magnetic field

• The more coils an electromagntic has, the weaker the magnetic field

• The larger the metal object, the stronger the magnetic field is

• There is no relationship between number of coils and the strength of a magnetic field

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To decrease the strength of a magnetic field around an electromagnet, we must

• increase the number of coils

• increase the size of the iron core

• decrease the size of the iron core

• decrease the number of coils