In items 11 through 30, select the best answer to make each...

In items 11 through 30, select the best answer to make each statement true. Place the letter of your answer in the space provided.
Strong magnetic fields may best be established in a core made of____
a. air.
b. steel.
c. nickel.
d. cobalt.

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Key Concepts

Ferromagnetism

Ferromagnetism is the phenomenon where certain materials can become permanently magnetized or greatly enhance magnetic fields due to the alignment of their atomic magnetic domains. This property is crucial in the operation of electromagnets and magnetic cores because it allows these materials to concentrate and amplify an applied magnetic field.

Magnetic Permeability

Magnetic permeability measures how well a material can support the formation of a magnetic field within itself. Materials with high permeability can channel more magnetic lines of force through them, which is essential for achieving strong magnetic fields when used as cores in electromagnets.

Electromagnet Cores

The core of an electromagnet is made from a material with high magnetic permeability in order to increase the strength of the magnetic field generated by the surrounding coil. The use of ferromagnetic core materials, rather than non-magnetic materials or air, substantially enhances the effectiveness of the electromagnet.

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