Magnets and Electromagnetism

What do Magnetic poles and electrical charges have in common

• They are pretty much the same

• The opposites are attracted to each other

• They are created only by moving electrons

• Like charges attract and so do like poles

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Which is a contrast between poles and charges.

• Like poles attract, so do like charges

• Opposite poles attract and so do opposite charges

• Opposite charges can be isolated. Opposite poles cannot

• Poles are created by protons, charges by electrons

A cluster of iron atoms have valence electrons with spins that align. What is this called?

• A domain

• a realm

• a Tesla

• A transformer

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With respect to an electric field or a magnetic field, how does the direction of the force on a charged particle differ?

• The force in a magnetic field is perpendicular to the field; in and electrical field the force is parallel.

• The force in a magnetic field is parallel to the field; in and electrical field the force is perpendicular.

• The force in either field is perpendicular.

• Forces in each field will always oppose each other. (Opposite directions)

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In order to experience force, a charged particle in a field must be:

• Stationary

• Moving

• moving parallel to the field lines

• attached to an atom

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How does the earths magnetic field most benefit humanity?

• It redirects cosmic rays

• It allows satellites to stay in orbit

• It attracts cosmic rays

• It allows for easy sea navigation.

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What evidence makes geologists conclude that the earth's magnetic field has switched poles several times?

• Detailed historical accounts

• Sophisticated computer simulations

• Magnetic fields in rock strata.

• There is no evidence of this.

In what direction would force act on a current carrying wire.

• perpendicular

• Parallel

• always upwards

• Opposite the geographic north pole.

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A transformer has 100 turns in a primary and 200 turns on the secondary coils. If a voltage of 100V is put across the primary, what will be the voltage output in the secondary?

• 200V

• 10V

• 20A

• 2000V

A transformer has 100 turns in the primary and 200 turns in the secondary. If the input voltage is 100V, and the transformer is connected to a floodlight that has 50ohms of resistance, what is the current in the secondary circuit?

• 4 A

• 40 amps

• 100V

• 2.5A

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