when we tie a magnet in a thread and hold thread in hands......We say that the pole pointing towards North pole of earth is North pole of the magnet and vice versa for south....but we know that like pole repel and unlike poles attract....then how can North pole of magnet face the North pole of Earth...

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That's a fascinating question! It touches on the fundamental principles of magnetism and how we define magnetic poles. Let's break this down step by step to clarify why the North pole of a magnet points toward the Earth's North pole, even though like poles repel each other.

The Basics of Magnetism

First, let's recap some key concepts about magnets. Every magnet has two poles: a North pole and a South pole. When you bring two magnets close together, the North pole of one magnet will attract the South pole of another magnet, while two North poles or two South poles will repel each other. This is the principle of "like poles repel, unlike poles attract."

Understanding Earth's Magnetic Field

Now, when we talk about the Earth's magnetic field, it's important to note that the Earth itself behaves like a giant magnet. The magnetic North pole of the Earth is actually located near the geographic North pole, but it is not the same as the North pole of a magnet. In fact, the Earth's magnetic North pole is a South magnetic pole in terms of magnetism.

Why Does the North Pole of a Magnet Point North?

When you suspend a magnet from a thread, the North pole of the magnet is attracted to the Earth's magnetic North pole. Since the Earth's magnetic North pole is a South magnetic pole, this attraction explains why the North pole of your magnet points toward it. In simpler terms, the North pole of your magnet is attracted to the South pole of the Earth’s magnetic field.

Visualizing the Concept

To visualize this, think of it like this: if you have two magnets, and you label one as North and the other as South, the North pole of the first magnet will be drawn toward the South pole of the second magnet. Similarly, the North pole of your magnet is drawn toward the Earth's magnetic South pole.

Real-World Implications

This understanding is crucial for navigation. Compasses, which contain a small magnet, align themselves with the Earth's magnetic field, allowing us to find our way. When you use a compass, the needle (which is a magnet) points toward the magnetic North, helping you navigate accurately.

In Summary

In essence, the North pole of a magnet points toward the Earth's North pole because the Earth's North pole is actually a magnetic South pole. This relationship between magnetic poles is foundational in understanding how magnets work in our world, especially in navigation and various technologies.