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Chapter 31: Q. 7 (page 900)

In what directions are the electromagnetic waves traveling in FIGURE

Short Answer

Expert verified

(a) Electromagnetic wave points travelling out of the page

(b) Electromagnetic wave points travelling upwards

Step by step solution

01

electromagnetic waves

Electromagnetic waves, or EM waves, are waves that are created whenever an electric field and a magnetic field move together. EM waves, in other words, are composed of alternating magnetoelectric fields.

02

Graph to explain (part a and b)

a.) The right-hand rule has E脳Bpoint out of the page.

b.) E脳Bpoints up.

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Most popular questions from this chapter

In FIGURE P31.33, a circular loop of radius rtravels with speed valong a charged wire having linear charge density I. The wire is at rest in the laboratory frame, and it passes through the center of the loop.

a. What are E鈫�and B鈫�at a point on the loop as measured by a scientist in the laboratory? Include both strength and direction.

b. What are the fields E鈫�and B鈫�at a point on the loop as measured by a scientist in the frame of the loop?

c. Show that an experimenter in the loop鈥檚 frame sees a currentI=位谓passing through the center of the loop.

d. What electric and magnetic fields would an experimenter in the loop鈥檚 frame calculate at distance r from the current of part c?

e. Show that your fields of parts b and d are the same.

Assume that a 7.0-cm-diameter, 100Wlight bulb radiates all its energy as a single wavelength of visible light. Estimate the electric and magnetic field strengths at the surface of the bulb.

The electric field of an electromagnetic wave in a vacuum is Ey=(20.0V/m)cos6.28脳108x-蝇迟, where is inlocalid="1648922287898" mandlocalid="1648922295234" tis in s. What are the wave's (a) wavelength, (b) frequency, and (c) magnetic field amplitude?

Older televisions used a loop antenna like the one in FIGUREQ31.9.How does this antenna Work?

A helium-neon laser emits a 1.0-mm-diameter laser beam with a power of 1.0mW. What are the amplitudes of the electric and magnetic fields of the light wave?
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