This preview shows page 1. Sign up to view the full content.
Unformatted text preview: the −y
direction, according to the righthand rule.
This means the x component of the magnetic ﬁeld is zero.
013 (part 2 of 3) 10.0 points
What is By ?
Correct answer: −0.0226667 T.
Explanation:
Since we know the magnetic ﬁeld points
along the −y direction, we know this component is nonzero and we know the sign. We
just need the magnitude, which we can ﬁnd
using
E Explanation:
The wave propagates at the speed of light.
So we can write
distance
c=
∆t
distance
⇒ ∆t =
c
10 m
5 m − (−5 m)
=
=
8 m/ s
3 × 10
3 × 108 m/s
= 3.33333 × 10−8 s .
012 (part 1 of 3) 10.0 points
A pulse of radiation propagates with velocity
0, 0, −c m/s
where c = 3 × 108 m/s. The electric ﬁeld in
the pulse is
6.8 × 106 N/C, 0, 0 N/C.
What is the magnetic ﬁeld in the pulse? First
give the x component, Bx .
Correct answer: 0 T.
Explanation: 4 c= .
B We have
E
B= c
6.8 × 106 N/C
=
3 × 108 m/s
= 0.0226667 T . Taking the sign into account, the y component is −0.0226667 T .
014 (part 3 of 3) 10.0 points
What is Bz ?
Correct answer: 0 T.
Explanation:
Following the explanation for part 1, the z
component of the magnetic ﬁeld is zero.
015 10.0 points
Consider the electromagnetic wave pattern as
shown in the ﬁgure below. dedow (kfd235) – Ch24h1 – turner – (56525) E B What is the direction in which the wave is
traveling?
1. undetermined, since the ﬁgure shows a
standing wave.
2. fromrighttoleft.
3. fromlefttoright. correct
Explanation:
The direction of traveling is the direction of
E × B ; i.e., fromlefttoright. 5...
View
Full
Document
 Summer '08
 Turner
 Work

Click to edit the document details