**MAGNETS AT A GLANCE**
**Key Definitions:**
• Magnetic Material = attracts to magnets (iron, nickel, cobalt)
• Non-magnetic Material = does not attract to magnets (wood, plastic, rubber, glass)
• Poles of Magnet = two ends where pull is strongest (North and South)
• Magnetic Compass = device with freely rotating needle to find directions
**Important Facts:**
• Magnet poles always exist in pairs—impossible to have only one pole
• Breaking a magnet creates new North and South poles in each piece
• Earth is a giant magnet → freely suspended magnet points North-South
• Lodestones = natural magnets (ancient times); Artificial magnets = human-made
• Compass red end = North pole (points toward North)
**How to Test if Something is Magnetic:**
1. Bring magnet near the object
2. If it sticks or gets attracted = magnetic
3. If nothing happens = non-magnetic
**Diagrams to Remember:** Bar magnet with iron filings showing concentrated at poles; Magnetic compass with needle pointing North-South; Lodestone and artificial magnets comparison
**Don't Confuse:** Magnetic material (gets attracted to magnet) ≠ Magnet itself (can attract things); North pole (seeks North) ≠ South pole (seeks South); Freely suspended magnet (always aligns N-S) ≠ Iron bar (can point any direction)
Q1. Which of the following is a magnetic material?
Answer: A — Iron is a magnetic material that is attracted to magnets, while rubber, wood, and glass are non-magnetic materials.
Q2. Which end of a freely suspended magnet points towards the North?
Answer: B — The North pole of a magnet is called the North-seeking pole because it always points towards the North direction.
Q3. If you break a bar magnet into two pieces, what will happen?
Answer: B — When a magnet is broken, each piece still has both North and South poles—poles always exist in pairs.
Q4. In the picture shown, iron filings stick most strongly at which part of the bar magnet? [Imagine a bar magnet with iron filings distributed unevenly]
Answer: B — The magnetic pull is strongest at the poles (ends) of a magnet, so maximum iron filings gather there.
Q5. Which of the following is NOT a magnetic material?
Answer: C — Plastic is a non-magnetic material and is not attracted to magnets, while iron, nickel, and cobalt are magnetic materials.
Q6. A magnetic compass helps sailors find directions because _____________ always points North-South.
Answer: B — The magnetic needle (which is itself a magnet) in a compass always aligns with Earth's magnetic field and points North-South.
Q7. What property of a magnet makes it useful for finding directions?
Answer: B — A freely suspended magnet always aligns with Earth's magnetic field and points North-South, which is why it is used in compasses.
Q8. In olden days, sailors used lodestones for finding directions because _____________ .
Answer: C — Lodestones are natural magnets that behave like bar magnets—they align with Earth's magnetic field and point North-South.
Q9. Why does a freely suspended iron bar NOT always point in the North-South direction, unlike a magnet?
Answer: B — An iron bar is magnetic material (attracted to magnets) but not a magnet itself, so it does not align with Earth's magnetic field.
Q10. Which statement is TRUE about the poles of a magnet?
Answer: C — North and South poles always exist as a pair in magnets; you cannot have a magnet with just one pole.
What are magnetic materials? Give two examples.
Materials that are attracted to a magnet; examples are iron, nickel, and cobalt.
Name three non-magnetic materials you use every day.
Wood (pencils), plastic (toys), rubber (erasers), glass (windows), cloth—these do not stick to magnets.
What are the two poles of a magnet?
North pole (or North-seeking pole) and South pole (or South-seeking pole).
Where is a magnet's pull the strongest?
At the two poles (the ends) of the magnet.
Can you have a magnet with only one pole?
No, North and South poles always exist in pairs; even if you break a magnet into small pieces, each piece has both poles.
What happens when you suspend a bar magnet freely?
It always comes to rest pointing in the North-South direction because Earth itself is a giant magnet.
What is a magnetic compass and how does it work?
A device with a freely rotating magnetic needle that points North-South to help find directions.
Why did ancient sailors use magnetic compasses?
When stars were hidden by storms or clouds, the compass needle always pointed North-South to help them find their way at sea.
What is the difference between a lodestone and an artificial magnet?
Lodestones are natural magnets found in nature (used in ancient times), while artificial magnets are made by humans from iron and other materials.
Why does a freely suspended iron bar NOT always point North-South?
Because iron is magnetic material but not a magnet itself; only actual magnets align with Earth's magnetic field.
Define magnetic material with one example. [1 mark]
Magnetic material is any material that is attracted to a magnet; example: iron, nickel, or cobalt.
List any two non-magnetic materials found in your school. [1 mark]
Non-magnetic materials are not attracted to magnets; examples from school: wood (pencils), plastic (ruler/toys), rubber (eraser), glass (window).
What happens to the poles when you break a bar magnet into two pieces? Explain with a reason. [2 marks]
Each piece gets both North and South poles. Reason: poles always exist in pairs and cannot be separated; breaking the magnet creates new poles at the break point.
Why did ancient sailors use magnetic compasses to find directions at sea? Explain how a magnetic compass works. [3 marks]
Sailors used compasses when stars were hidden. A compass has a freely rotating magnetic needle that always aligns with Earth's magnetic field and points North-South, showing all four directions.
Describe Activity 4.2 (iron filings experiment). What does this activity demonstrate about a magnet, and what conclusion did you draw? [5 marks]
Activity: sprinkle iron filings on paper, place bar magnet on top, tap paper gently. Observation: maximum filings stick at the two ends (poles). Conclusion: magnetic pull is strongest at poles; every magnet has two poles (North and South) where attraction is maximum, regardless of magnet shape. Draw and label a diagram showing bar magnet with iron filings concentrated at both poles.
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