Electromagnetism

What is induced when a wire is carrying a current?

• Electricity

• Electrons

• A Magnetic Field

• A Voltage

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Using the right-hand curl, how would you draw the magnetic field around this wire? The direction of current is drawn for you.

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What can increase the strength of the magnetic field at a single point near a current carrying wire?

• Increasing the length of the wire.

• Increasing the width (diameter) of the wire.

• Increasing the current (moving electrons) through the wire.

• Changing the material of the wire.

Answer explanation

Changing the material or diameter of the wire may result in changes in current.

But, it is the amount of current (moving electrons) that induces a magnetic field.

More current -> Stronger Field

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• Current increases.

• Current decreases.

• Current stays the same.

• Current flows in the opposite direction.

What is this coil of current-carrying wire called?

• Oculoid

• Spiraloid

• Colloid

• Solenoid

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How does a solenoid increase the magnetic field around the wire?

• Allows a higher voltage.

• Allows a higher current.

• Brings field around the wire closer together.

• Decreases resistance in the wire.

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What do magnetic fields do to other magnetic fields?

• Attract or Repel

• Attract

• Repel

• Nothing

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For magnetic fields to pull or push objects away, there must be...

• friction.

• resistance.

• current.

• a force.

Answer explanation

For objects to move there must be a force (push or pull).

Magnetic fields can create a force with other magnetic fields.

This is why magnets attract or repel one another.

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What would happen to this current carrying wire in the middle of an external magnetic field?

• It would experience a force.

• It would heat up.

• It would break.

• Nothing.

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A motor works by putting a coil of wire in a magnetic field. The loop of wire rotates inside the field when it is carrying a current. What might happen if the wires were held in place?

• The wire will twist and get tangled.

• Nothing.

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