6.4 The Magnetic Field of a Solenoid

An electromagnet is

• an object that exerts magnetic force

• an object that exerts electric force

• an object that exerts electric force using magnetism

• an object that exerts magnetic force using electricity

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A solenoid is

• a coil of wire that acts like a magnet when electricity passes through it.

• a straight wire that acts like a magnet when electricity passes through it

• a coil of wire that acts like a battery when electricity passes through it.

• a straight wire that acts like a battery when electricity passes through it

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If the current is going up on the front side of the coil then what side of the electromagnet is north?

• Up
• Down
• Left
• Right

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If you wrap more coils around an electromagnet, it will become 

• brighter
• stronger
• weaker
• invisible

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In order to create this electromagnetic with a solenoid, which direction would current be flowing on the side closest to us?

• up

• down

• left

• right

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If the current in a solenoid is decreased,

• the induced magnetic field is weaker and its direction is reversed

• the induced magnetic field is weaker and its direction stays the same

• the induced magnetic field is stronger and its direction is reversed

• the induced magnetic field is stronger and its direction stays the same

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Which is true?

• Paramagnetic materials increase the magnetic field strength by a lot when placed in a solenoid

• Paramagnetic materials increase the magnetic field strength by a bit when placed in a solenoid

• Paramagnetic materials decrease the magnetic field strength by a lot when placed in a solenoid

• Paramagnetic materials decrease the magnetic field strength by a bit when placed in a solenoid

Which is true?

• Diamagnetic materials increase the magnetic field strength by a lot when placed in a solenoid.

• Diamagnetic materials increase the magnetic field strength by a bit when placed in a solenoid.

• Diamagnetic materials decrease the magnetic field strength by a lot when placed in a solenoid.

• Diamagnetic materials decrease the magnetic field strength by a bit when placed in a solenoid.

Select all that apply. Which of these are applications of electromagnets?

• lifting electromagnets

• bar magnets

• fridge magnets

• relays

• electric bells

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