Educational worksheet on magnets and electromagnets featuring interactive exercises for learning magnetic properties and terminology.

Let's go through each section of the worksheet and solve it step by step, with explanations.

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1. Choose the correct word to complete these sentences:

a. All magnets have ______ opposite poles.
✔ two
*Explanation:* Every magnet has two poles — a north pole and a south pole. You cannot have a magnet with just one pole (a magnetic monopole doesn't exist in nature).

b. Identical poles ______ each other.
✔ repel
*Explanation:* Like poles (north-north or south-south) repel each other.

c. Opposite poles ______ each other.
✔ attract
*Explanation:* Unlike poles (north-south) attract each other.

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2. Drag and drop words from the box to complete the sentences.

Available words:
> temporary, weakest, magnetite, magnetic poles, molten iron, magnetic field, induced, needle, artificial, permanent, filings, cosmic radiation, strongest, nickel

a. A/An ______ magnet never loses its magnetism.
✔ permanent
*Explanation:* Permanent magnets retain their magnetism over time unless subjected to strong external forces (like heat or hammering).

b. A/An ______ is the area around a magnet where its force has an effect.
✔ magnetic field
*Explanation:* The magnetic field is the region where magnetic forces act on other magnetic materials or moving charges.

c. All compasses contain a magnetised ______ which points north.
✔ needle
*Explanation:* The compass needle is a small magnet that aligns itself with Earth’s magnetic field, pointing toward the magnetic north.

d. The Earth has two ______, located near the geographical poles.
✔ magnetic poles
*Explanation:* Earth behaves like a giant magnet with a magnetic north and south pole, close to but not exactly at the geographic poles.

e. The magnetic force of an induced magnet is ______.
✔ weakest
*Explanation:* An induced magnet (like a piece of iron becoming magnetic when near a magnet) only has magnetism while in the presence of the magnetic field. Its strength is generally weaker than permanent magnets.

f. Small pieces of iron, called ______, can help us see the effect of a magnetic field.
✔ filings
*Explanation:* Iron filings align along magnetic field lines when placed near a magnet, making the invisible field visible.

g. The Earth's core contains ______, which acts like a giant magnet.
✔ molten iron
*Explanation:* The outer core of Earth is made of molten iron and nickel. The movement of this liquid metal generates Earth’s magnetic field via the geodynamo effect.

h. The areas around a magnet's poles are where the magnetic field is the ______.
✔ strongest
*Explanation:* Magnetic field lines are densest near the poles, indicating the strongest magnetic force.

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3. What is electromagnetism? Fill in the gaps in the definition:

Electromagnetism is the relationship between ________ and ________.
✔ electricity and magnetism
*Explanation:* Electromagnetism is a fundamental force that describes how electric currents create magnetic fields and how changing magnetic fields can induce electric currents (Faraday’s Law). This interplay forms the basis of electromagnets, motors, generators, etc.

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4. Which of the following materials are magnetic?

Materials:
- silver ✘
- nickel ✔
- copper ✘
- glass ✘
- steel ✔
- iron ✔

✔ Magnetic materials: nickel, steel, iron
*Explanation:*
- Iron, nickel, and cobalt are naturally magnetic (ferromagnetic).
- Steel is an alloy of iron and carbon, so it's also magnetic.
- Silver, copper, and glass are non-magnetic.

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✔ Final Answers Summary:

#### 1.
a. two
b. repel
c. attract

#### 2.
a. permanent
b. magnetic field
c. needle
d. magnetic poles
e. weakest
f. filings
g. molten iron
h. strongest

#### 3.
Electromagnetism is the relationship between electricity and magnetism.

#### 4.
Magnetic materials: nickel, steel, iron

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