Topic: Electromagnetics
Magnetic field intensity (H), within a magnetic material where, $M=150~\text{A/m}$, $\mu=1.5\times10^{-5}\text{H/m}$, $\mu_{r}=30$;
- A. $14.921~\text{A/m}$
- B. $14.138~\text{A/m}$
- C. $1.82~\text{A/m}$
- D. $13.715~\text{A/m}$
Explanation: Given, $M=150~\text{A/m}$ and $\mu_r = 30$.
We know that magnetization $M = \chi_M H$, where $\chi_M$ is the magnetic susceptibility.
$\chi_M = \mu_r - 1 = 30 - 1 = 29$.
Magnetic field intensity $H = \frac{M}{\chi_M} = \frac{150}{29} \approx 5.172~\text{A/m}$.
None of the options match the correct calculated value.