Question

What is susceptibility of a medium, if its relative permeability is 0.85?

• A. 1.85
• B. 0.15
• C. \(-0.15\)
• D. \(-0.85\)

Hint:

Remember: \(\mu_r = 1 + \chi\). For diamagnetic materials, \(\mu_r < 1\) and \(\chi\) is negative.

Answer 1

The Correct Option is C

Step 1: Understanding the Question:
We are given relative permeability \(\mu_r = 0.85\). We need the magnetic susceptibility \(\chi\).

Step 2: Key Formula or Approach:
The relation between relative permeability and susceptibility is: \(\mu_r = 1 + \chi\).

Step 3: Detailed Explanation:
\[ \chi = \mu_r - 1 = 0.85 - 1 = -0.15. \] Negative susceptibility indicates a diamagnetic material.

Step 4: Final Answer:
Thus susceptibility is \(-0.15\), option (C).