Fun with Magnets worksheet for Grade VI students, including questions on magnetism concepts, definitions, and practical identification of magnetic materials.

Here is the completed worksheet with explanations for each answer:

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1. Fill in the blanks.

a. _Demagnetization_ is the phenomenon in which a permanent magnet loses its magnetism.
*Explanation:* Demagnetization occurs when a magnet is exposed to high heat, strong opposing magnetic fields, or physical shock, causing its magnetic domains to become disordered and lose their alignment.

b. The axis of a freely suspended magnet always aligns in a _north-south_ direction.
*Explanation:* A freely suspended magnet aligns itself with Earth’s magnetic field — its north pole points toward Earth’s magnetic north (which is near geographic south), and its south pole points toward Earth’s magnetic south (near geographic north). So we say it aligns in the north-south direction.

c. _Keeper_ is used to prevent self-demagnetization of magnets.
*Explanation:* A keeper (usually a soft iron bar) is placed across the poles of a horseshoe or bar magnet when stored. It provides a closed path for magnetic flux, preventing the magnet from losing strength over time by reducing internal demagnetizing fields.

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2. Define.

a. Magnetite
*A naturally occurring magnetic mineral (Fe₃O₄), also known as lodestone. It is one of the few minerals that is magnetic in its natural state and was historically used to make early compasses.*

b. Magnetic axis
*The imaginary straight line joining the two poles (north and south) of a magnet. It represents the direction along which the magnet’s magnetic field is strongest.*

c. Magnetic force
*The attractive or repulsive force exerted between magnetic poles or between a magnet and a magnetic material (like iron). Like poles repel; opposite poles attract.*

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3. Give answer in one word.

a. Iron pieces used for sorting magnets _Magnetic_
*Explanation:* Iron pieces are attracted to magnets, so they are used to test or sort magnetic materials. The key property here is “magnetic” — meaning capable of being attracted to a magnet.

*(Note: If the question meant “what are these iron pieces called?” — it might be “ferromagnetic materials,” but since it says “in one word,” and context is sorting magnets, “Magnetic” fits best.)*

b. The region around a magnet where its influence is felt _Field_
*Explanation:* This is the “magnetic field” — the space around a magnet where its magnetic force can be detected.

c. Method of making magnet using one magnet _Induction_
*Explanation:* Magnetic induction is the process of magnetizing a magnetic material (like an iron nail) by bringing it close to or stroking it with a permanent magnet, without direct contact or electricity.

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4. Group the substances given below as magnetic or non-magnetic substances. Use a magnet if possible

*(Note: Since no list of substances was provided in your image or text, I’ll give you a sample list and group them. You can replace this with your actual list.)*

Sample Substances:
- Iron nail → Magnetic
- Copper wire → Non-magnetic
- Aluminum foil → Non-magnetic
- Steel spoon → Magnetic (steel contains iron)
- Plastic comb → Non-magnetic
- Nickel coin → Magnetic
- Wooden block → Non-magnetic
- Cobalt bar → Magnetic

*How to test:* Bring a magnet close to each item. If it attracts, it’s magnetic (typically iron, nickel, cobalt, or steel). If not, it’s non-magnetic (e.g., plastic, wood, copper, aluminum).

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✔ Final Answers Summary:

1.
a. Demagnetization
b. North-south
c. Keeper

2.
a. Naturally magnetic mineral (Fe₃O₄)
b. Line joining N and S poles of a magnet
c. Force of attraction/repulsion between magnetic poles

3.
a. Magnetic
b. Field
c. Induction

4. *(Example grouping — adapt to your list)*
Magnetic: Iron nail, Steel spoon, Nickel coin, Cobalt bar
Non-magnetic: Copper wire, Aluminum foil, Plastic comb, Wooden block

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Let me know if you have a specific list of substances for Question 4 — I’d be happy to help group them!