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posted by  mck113 on 11/5/2009 12:22:15 AM  |  status: Live  |  Earned Karma: 25

general physics?!?!

Course Textbook Chapter Problem Needs by
General Physics N/A N/A N/A 11/5/2009 at 11:00:00 AM
Question Details:

A microwave transmitter emits electromagnetic waves of a single wavelength. The maximum electric field 1.22 km from the transmitter is 6.74 V/m. Assuming that the transmitter is a point source,

a. Calculate the maximum magnetic field at this distance.

b. Calculate the total power emitted by the transmitter.
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posted by esther_jyothi on 11/5/2009 12:24:42 AM  |  status: Live
Asker's Rating: Helpful   
Response Details:
a). Maximum electric field  E = 6.74 V / m
Maximum magnetic field  B = E / c
                                          = 6.74 / ( 3 * 10 ^ 8 )
                                          = 2.246 * 10 ^ -8 T
(b). Total power P = cεE ^ 2
where c = speed of EM wave = 3 * 10 ^ 8 m / s
        ε = permitivity of free space = 8.85 * 10 ^ -12 N m ^ 2 / C ^ 2
plug the values  P = 1206.1 * 10 ^ -4 W / m ^ 2
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