Question

question 24

man-made permanent magnets retain their magnetism ______ than natural magnets.
a. less
b. longer

Explanation:

Compare natural and artificial magnets

Using the Lodestone and Magnetite knowledge points
Natural magnets like lodestone (magnetite) have relatively low magnetic retentivity and weak magnetic fields compared to modern synthetic materials.

Analyze magnetic retentivity

Man-made permanent magnets are engineered using advanced ferromagnetic alloys (such as Alnico, Neodymium, or Samarium-Cobalt) designed specifically to resist demagnetization and retain their magnetic strength far longer than natural magnets.

Answer:

• a. less
• b. longer (Correct answer)