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Unformatted text preview: associated electric ﬁeld? Remember that c = 3 × 108 m/s.
Correct answer: 12900 N/C.
Knowing that 005 (part 1 of 3) 10.0 points
In the ﬁgure below, electromagnetic radiation
is moving to the right, and at this time and
place the electric ﬁeld is horizontal and points
out of the page. The magnitude of the electric
ﬁeld is E = 2850 N/C. The speed of light is
c = 3 × 108 m/s. Take +x to be toward the
right, +y to be upward, and +z to be out of
the page toward you.
E = 2850 N/C
What is the associated magnetic ﬁeld at
this time and place? Begin by ﬁnding the x
component, Bx .
Correct answer: 0 T.
We can determine the nonzero component
of B by using the right-hand rule. With the
wave propagating in the +x direction, and the
electric ﬁeld in the +z direction, the magnetic
ﬁeld must point in the −y direction. Therefore the x and z components of the magnetic
ﬁeld are both zero.
006 (part 2 of 3) 10.0 points
Find By .
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- Summer '08