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Chapter 22: Problem 7

If a bar magnet is broken into two pieces, how many magnetic poles are there?

Short Answer

Expert verified
There will be 4 magnetic poles.

Step by step solution

01

Understanding Magnet Poles

Magnetic poles are regions at the ends of a magnet where the magnetic force is strongest. A bar magnet has two poles: a north (N) pole and a south (S) pole.
02

Breaking the Bar Magnet

When a bar magnet is broken into two pieces, each piece will still have both a north and a south pole. This is because the atoms in a magnet are aligned in such a way that each piece retains its north and south poles.
03

Determining the Number of Poles

Initially, the bar magnet has 2 magnetic poles. After breaking it into two pieces, each piece will have its own north and south pole. Therefore, there will be 4 magnetic poles in total.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

bar magnet
A bar magnet is a simple and common type of magnet. It has a rectangular or cylindrical shape. The ends of a bar magnet are called the poles.
One end of the bar magnet is the north pole, which is usually marked with an 'N', and the other end is the south pole, marked with an 'S'.
Magnets are made from materials like iron, cobalt, nickel, or alloys that have high magnetic properties.
Magnetic materials have many tiny regions called magnetic domains.
In these domains, the atoms' magnetic moments are aligned in the same direction.
magnetic force
Magnetic force is the force of attraction or repulsion between magnetic poles.
It is strongest at the poles of a magnet because that's where the magnetic field lines are densest.
This force can either pull magnets together (attraction) or push them apart (repulsion).
The rule of magnetic forces is that opposite poles attract each other, while like poles repel each other.
This means the north pole of one magnet will attract the south pole of another magnet, and vice versa.
alignments of atoms
Inside a magnet, atoms have a special alignment.
Each atom acts like a small magnet, with its own north and south poles.
In a magnetized material, most of these atomic magnets are aligned in the same direction.
This alignment causes the magnetic fields of all the atoms to add up, creating a strong overall magnetic field.
When a bar magnet is broken into two pieces, this alignment is not disrupted.
Each piece retains the arrangement of its atoms, ensuring that both new pieces have a north and south pole.

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Most popular questions from this chapter

A metal ball with a mass of \(3 \mathrm{g}\), a charge of \(1 \mu \mathrm{C},\) and a speed of \(40 \mathrm{m} / \mathrm{s}\) enters a magnetic field of \(20 \mathrm{T}\). What are the maximum force and acceleration of the ball?

The voltage in the lines that carry electric power to homes is typically 2000 V. What is the required ratio of the loops in the primary and secondary coils of the transformer to drop the voltage to \(120 \mathrm{V} ?\)

What does it mean when your local disc jockey says that you are "listening to radio \(1380 " ?\)

Your classmate claims: "To find the direction of the magnetic field at any point, you simply hold a compass in your hand and see what direction the needle points. Because the needle always points parallel to the ground, the magnetic field must also be parallel to the ground." This conclusion is inconsistent with the statement in the text that Earth's field points strongly downward in the United States. What is the flaw in your classmate's reasoning?

Why might it be more proper to call a north magnetic pole a "north-seeking" magnetic pole?
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