Electromagnetic Fields and Waves: Including Electric Circuits

Paul Lorrain, Dale R. Corson

Chapter 20 Magnetic Fields Iii - all with Video Answers

Educators

Chapter Questions

Problem 1

The number of Bohr magnetons per atom in iron
The magnetization $M$ in iron can contribute as much as 2 teslas to $B$. If one electron contributes one Bohr magneton, how many electrons per atom, on average, can contribute to $M ?$ See Prob. 18-5.

Prabhakar Kumar

Numerade Educator

01:47

Problem 2

The ficld of a disk magnet
A disk of iron of radius $a$ and thickness $s$ is magnetized parallel to its axis. Calculate $B$ on the axis, outside the iron.

Ajay Singhal

Numerade Educator

01:31

Problem 3

The field inside a tubular magnet
You are asked to design a permanent magnet that would supply a magnetic field in a cylindrical volume about 20 millimeters in length and 20 millimeters in diameter. Someone suggests a tubular magnet, magnetized along its length, that would surround this volume. What do you think of this suggestion?

Salamat Ali

Numerade Educator

01:01

Problem 4

The divergence of $\boldsymbol{H}$ is not always zero
Show that $\boldsymbol{\nabla} \cdot \boldsymbol{H}$ is not zero in a nonhomogeneous magnetic material.

James Kiss

Numerade Educator

04:16

Problem 5

The field in a cavity inside magnetic material
Find $B$ and $H$ inside a thin, disk-shaped cavity whose axis is parallel to $B$, inside magnetic material.

Amit Srivastava

Numerade Educator

01:18

Problem 6

The free and equivalent volume current densities,
Show that, in a homogeneous, isotropic, and linear magnetic material. $\boldsymbol{J}_{e}=\left(\mu_{r}-1\right) \boldsymbol{J}_{f}$

Nadir Iqbal

Numerade Educator

07:50

Problem 7

Current-carrying wire along the axis of an iron tube
A wire carrying a current $I$ is situated on the axis of a hollow iron cylinder.
(a) Find $H, B$, and $M$ in the inner region, in the iron, and in the outer region.
(b) Find the equivalent currents.

Eduard Sanchez

Numerade Educator

01:03

Problem 8

20.7) The magnetization in terms of $\chi_{m}$ and $B$
Show that in a linear and isotropic magnetic medium.
$$
M=\frac{\chi_{m} B}{\mu_{0}\left(1+\chi_{m}\right)}
$$

Farhanul Hasan

Numerade Educator