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1
Reminders and Announcements
• HW 18 is due today; HW 19 will be due
next Friday
• Help Room Hours (Physics 117)
Help Room
Hours (Physics 117):
– M 48 pm, T 36:30, W 36:30, R 4:308, F 26
Chapter 34
Electromagnetic Waves
James Clerk Maxwell
• In 1865, James Clerk
Maxwell provided a
mathematical theory that
showed a close
relationship between all
electric and magnetic
phenomena
• Maxwell’s equations also
predict the existence of
electromagnetic waves
that propagate through
space
Displacement Current
• Ampere’s law in the original form is valid
only if any electric fields present are
constant in time
– Maxwell modified the law to include time
varying electric fields
• Maxwell added an additional term which
includes a factor called the
displacement
current
, I
d
Displacement Current
• The electric flux
through S
2
is
EA
–
A
is the area of the
capacitor plates
–
E
is the electric field
between the plates
• If
q
is the charge on
the plate at any time,
Φ
E
=
EA
=
q
/
ε
o
Displacement Current
• Therefore, the displacement current is
E
do
dd
q
I
ε
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This document was uploaded on 09/30/2009.
 Spring '09
 Physics

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