# Which of these metals provide magnetic shielding?

• lioric
In summary, the question is about a theory question in an olevel paper and the marking scheme states that the answer should be B. The asker is confused about why paper clips fall when iron is inserted but not when copper is inserted, despite both materials having different magnetic properties. The answer is that the magnetic lines of force interact with magnetic materials like iron differently than non-magnetic materials like copper, causing the paper clips to fall. Thank you.

## Homework Statement

This a question from an olevel paper and the marking scheme says B
I don't understand why

## Homework Equations

None a theory question

## The Attempt at a Solution

Aluminum and copper has less magnetic property while iron is good magnetic material. I cannot understand why the paper clips should fall when iron is inserted and not fall when copper is inserted.

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The magnetic lines of force pass through non magnetic materials like the cardboard and non-ferrous metals. They interact with magnetic metals like the iron in the paperclips. But a sheet of magnetic metal will cause the lines of force to redirect, and they are no longer passing through the paperclips.

scottdave said:
The magnetic lines of force pass through non magnetic materials like the cardboard and non-ferrous metals. They interact with magnetic metals like the iron in the paperclips. But a sheet of magnetic metal will cause the lines of force to redirect, and they are no longer passing through the paperclips.
Thank you very much

scottdave

## 1. What is magnetic shielding?

Magnetic shielding is a process in which a material is used to create a barrier that reduces or eliminates the effects of a magnetic field on a specific area or object.

## 2. Why is magnetic shielding important?

Magnetic shielding is important because it can protect sensitive electronic equipment, such as computers and medical devices, from interference caused by magnetic fields. It can also prevent magnetic fields from affecting nearby objects or environments.

## 3. What types of metals provide magnetic shielding?

The most commonly used metals for magnetic shielding are iron, nickel, and cobalt. These metals have high magnetic permeability, which means they can easily redirect magnetic fields.

## 4. How does magnetic shielding work?

Magnetic shielding works by creating a barrier of highly permeable material around the object or area that needs protection. This material redirects the magnetic field lines, reducing their strength and preventing them from affecting the protected area.

## 5. What are some techniques for measuring the effectiveness of magnetic shielding?

There are several techniques for measuring the effectiveness of magnetic shielding, including magnetic field mapping, gaussmeter measurements, and magnetic flux density measurements. These techniques can determine the strength of the magnetic field before and after shielding, providing a measure of the shielding's effectiveness.