Question

question 26

the amount of magnetism left in a material after the magnetizing force has stopped is called ______.
a. residual magnetism
b. reluctance
c. saturation
d. permeability

Explanation:

Define the core concept

Using the Magnetic Retentivity knowledge point

Residual magnetism is the magnetic induction remaining in a ferromagnetic material after the external magnetizing force is reduced to zero.

Analyze the given options

• a. residual magnetism: This directly matches the definition of the remaining magnetism after the magnetizing force has stopped.
• b. reluctance: This is the opposition that a material offers to the passage of magnetic flux, analogous to electrical resistance.
• c. saturation: This is the state reached when an increase in external magnetizing force produces no further increase in magnetic flux density.
• d. permeability: This is a measure of the ability of a material to support the formation of a magnetic field within itself.

Select the correct option

Comparing the definitions, option a is the correct term for the remaining magnetism.

Answer:

• a. residual magnetism (Correct answer)
• b. reluctance
• c. saturation
• d. permeability