T5 L 3 Electromagnetic Force

What are the properties of electromagnets?

• They are permanent magnets.

• They can be turned on and off.

• They do not require electricity.

• They are made of wood.

What conclusion did Ørsted reach about electric current?

• It produces heat

• It produces a magnetic field

• It produces light

• It produces sound

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What is the effect of an electric current on a nearby compass needle?

• It makes the needle glow

• It changes the needle's direction

• It breaks the needle

• It heats the needle

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What scientific principle is demonstrated by the crane's magnet lifting heavy metal beams?

• Electromagnetism

• Gravity

• Friction

• Inertia

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What did Ørsted conclude about the relationship between electricity and magnetism?

• They are unrelated

• They are the same

• They are related

• They cancel each other out

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What rule is used to determine the direction of a magnetic field around a straight wire?

• Left-Hand Rule

• Right-Hand Rule

• Thumb Rule

• Index Finger Rule

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What is the main topic Lesson 3?

• Electric circuits

• Magnetic fields and current

• Electromagnetic force

• Electric resistance

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What is the relationship between the current and the magnetic field strength?

• No relationship

• Inversely proportional

• Directly proportional

• Exponentially related

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What effect does winding the coils closer together have on a solenoid?

• It weakens the magnetic field

• It has no effect

• It strengthens the magnetic field

• It decreases the current

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What advantage does an electromagnet have over a solenoid in an MRI machine?

• A) It is cheaper to produce.

• B) It provides a stronger magnetic field.

• C) It requires no electricity.

• D) It is smaller in size.