Magnetism and Compass Navigation

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Questions and Answers

Which object should Leroy keep away from a compass to avoid interference when determining magnetic north?

An aluminum ring-pull
A 10p coin
A brass key
A steel penknife (correct)

Will a magnet attract a piece of iron through a plastic plate?

Yes, because plastic is easily magnetized.
No, the plastic will weaken the magnetic field significantly.
No, because plastic blocks all magnetic fields
Yes, because magnetic fields can pass through plastic. (correct)

If a steel ball is attracted to the south pole of a magnet, and another steel ball is hanging from it, what would happen to the hanging ball if a second magnet's north pole is brought into contact with the first ball?

The lower ball's position will not change.
The lower ball will be strongly attracted to the second magnet now.
The lower ball will be repelled by the second magnet now. (correct)
The lower ball will fall off.

Which of the following is NOT a property of magnetic field lines?

<p>Magnetic field lines are densest further away from the poles. (D)</p> Signup and view all the answers

Why is it true that magnetic field lines never intersect?

<p>Because magnetic fields only exist in one direction at each point. (D)</p> Signup and view all the answers

Flashcards

What are magnetic materials?

Magnetic materials, such as iron, nickel, and cobalt, are attracted to magnets. Non-magnetic materials, such as aluminum, brass, and copper, are not attracted to magnets.

How do magnetic poles interact?

When unlike poles of two magnets face each other, they attract, while like poles repel each other.

What are magnetic field lines?

Magnetic field lines are imaginary lines that represent the direction of the magnetic force. They are always directed from the north pole to the south pole of a magnet.

Why don't magnetic field lines intersect?

Magnetic field lines never intersect because the magnetic force is a vector quantity, meaning it has both magnitude and direction. At any point, the magnetic force has a single direction, represented by the tangent to the field line at that point.

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How can we map magnetic fields?

One method is to use iron filings. When iron filings are sprinkled around a magnet, they align themselves along the magnetic field lines, revealing the shape of the magnetic field.

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Study Notes

Identifying Magnetically Compatible Items

Leroy has five items in his pocket, including a compass. He should keep aluminum, brass, and keys away from the compass when using it for navigation. A 10p coin is safe.

Magnetism Through Materials

A magnet can attract iron through a plastic plate.

Magnetic Field Mapping

Sketch a magnetic flux map of two identical bar magnets placed with opposite poles facing each other.
Show the neutral point on the map.

Interaction of Magnets and Steel Balls

A steel ball is attracted to the south pole of a bar magnet.
If a second magnet with an unknown pole is placed adjacent to the first ball and held horizontally, the lower ball's movement depends on the nature of the second magnet's pole.

Earth's Magnetic Field and Compass

A diagram shows a compass needle on a bench, impacted by the Earth's magnetic field.
The compass needle aligns with the Earth's magnetic field.

Compass Deviation by External Magnet

Place a bar magnet near the compass.
Re-draw the diagram to show the new compass needle alignment. Explain the change.

Magnetic Field Lines

Define magnetic field lines and their properties.
Explain the property "Field lines never intersect".

Mapping Magnetic Fields

Describe a method for mapping magnetic fields.

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Description

Explore the principles of magnetism and its interactions with various materials through this quiz. Understand how different items can impact compass readings and learn to map magnetic fields. Test your knowledge of Earth's magnetic influence on navigation tools like compasses.