to these questions.

Ηλεκτρονική - Συσκευές

18 Οκτ 2013 (πριν από 4 χρόνια και 8 μήνες)

100 εμφανίσεις

Explain, using Maxwell’s
theory of electric and
to these questions.

(1) Why is dielectric material
placed in a capacitor?

(2) Why does light reflect from a
glass surface?

(3) Why is the sky blue at noon?

(4) Relate F

to
E

and
B
.

(5) Determine
E

inside a moving
capacitor.

(6) Which Maxwell equation
describes an electric generator?

(7) What is a photon?

(8) Why are clouds white on a
partly cloudy day?

(9) How does the
plasma
frequency

in a plasma affect
electromagnetic waves?

(10) Describe the magnetic field
due to a moving change.

(11) Explain the levitating frog

(12) Why are sunsets red?

(13) How does the ionosphere

(14) Why do fishermen wear
polarized sunglasses?

(15) How far will a muon,
produced in the upper
atmosphere, travel before it
decays. Assume

= 100.

Correct explanation in
terms of fields = 1 point.

Equations or quantitative
reasoning = 1 point.

3 points per problem

Dielectrics

Theory

Matter is atomic.

The atoms are polarized by an
electric field.

What is bound charge?

Applications

Capacitance = Q/V

Magnetism in materials

Theory

Matter is atomic.

The atoms are magnetized by a
magnetic field.

What is bound current?

Applications

A solenoid with an iron core

Boundary conditions of the
fields

You have two uniform regions of
space divided by a boundary.
What can you say about the
normal and tangential
components of the fields on
opposite sides of the boundary?

Time
-
dependent fields #1

Theory

Lenz’s law; the right
-
hand
rule.

Applications

inductance

electric power technology
(transformers and generators)

Kerst’s Betatron

Time
-
dependent fields #2

Theory

What are the consequences of
the displacement current?

Electromagnetic Waves in free
space

Transverse waves

Polarization

Energy density

Energy flux

Optics
--

EM waves and
matter

Light and transparent
dielectrics, like glass or
water

Light and metals

Light and a diffuse
plasma

Light scattering from
atoms.

Relativity and Electromagnetism

Covariant equations versus time
and space components.

Lorentz transformations of fields.

Particle dynamics

Equations of field transformations