Question

In a permanent magnet at room temperature

• A. Magnetic moment of each molecule is zero
• B. The individual molecules have non-zero magnetic moment which are all perfectly aligned
• C. Domains are partially aligned
• D. Domains are all perfectly aligned

Answer 1

The Correct Option is C

In a permanent magnet, at room temperature, the individual magnetic moments of the molecules are non-zero, but the domains (regions where magnetic moments are aligned) are not fully aligned. Some random thermal motion prevents the perfect alignment of the domains. This results in a net magnetic moment for the magnet, but not all the domains are perfectly aligned. Therefore, the correct answer is (C).

So, the correct answer is (C): Domains are partially aligned.