Question

platinum, titanium, and chromium are examples of _________ materials.
a. ferromagnetic
b. diamagnetic
c. permanent
d. paramagnetic

Explanation:

Analyze the magnetic properties of the listed metals

Using the Paramagnetism, Ferromagnetism, and Diamagnetism knowledge points

• Platinum (\(\text{Pt}\)), titanium (\(\text{Ti}\)), and chromium (\(\text{Cr}\)) are weakly attracted by an externally applied magnetic field.
• They do not retain permanent magnetization when the external field is removed.
• This weak, positive susceptibility to magnetic fields is the defining characteristic of paramagnetic substances.

Evaluate the given multiple-choice options

Using the Magnetic Materials knowledge point

• a. ferromagnetic: Strongly attracted to magnets (e.g., iron, nickel, cobalt). Incorrect.
• b. diamagnetism: Weakly repelled by magnetic fields (e.g., copper, bismuth). Incorrect.
• c. permanent: Materials that maintain constant magnetization (e.g., lodestone, alnico). Incorrect.
• d. paramagnetic: Weakly attracted by an external magnetic field. Correct.

Answer:

• a. ferromagnetic
• b. diamagnetic
• c. permanent
• d. paramagnetic (Correct answer)