Magnetic Permeability

Mr. Andersen explains magnetic permeability, the ability of materials to create internal magnetic fields. He begins by discussing magnetic fields using bar magnets and a compass. The concept of magnetic permeability is introduced, highlighting its measurement in free space and materials. The video explains how to measure permeability using a toroid and compares the permeability of different materials, emphasizing the high permeability of iron. The video concludes with a discussion on relative permeability, comparing materials like wood, aluminum, and magnetic elements.

What tool is used to visualize magnetic fields around a magnet?

• A voltmeter

• A compass

• A thermometer

• A barometer

What does magnetic permeability measure?

• The ability of a material to absorb sound

• The ability of a material to reflect light

• The ability of a material to create internal magnetic fields

• The ability of a material to conduct electricity

What happens to the magnetic field when a material with high magnetic permeability is introduced?

• The field becomes weaker

• The field remains unchanged

• The field disappears

• The field becomes stronger and warps

What is the term for the magnetic permeability of a vacuum?

• Mu sub 2

• Mu sub 3

• Mu sub 1

• Mu sub 0

Which material has a relative magnetic permeability close to 1?

• Cobalt

• Wood

• Nickel

• Iron

Why is iron considered a good magnet?

• It is a good conductor of electricity

• Its molecular structure easily induces magnetic fields

• It has a high melting point

• It is lightweight

Which of the following materials is not likely to be magnetized?

• Nickel

• Cobalt

• Aluminum

• Iron