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: Recall the link.
Relative permeability and susceptibility are tied by $\mu_r = 1 + \chi$.

Step 2: Rearrange.
So $\chi = \mu_r - 1$.

Step 3: Substitute.
$\chi = 0.85 - 1 = -0.15$.

Step 4: Read the sign.
The negative value tells us the material is diamagnetic. \[ \boxed{\chi = -0.15} \]