## Classical Electromagnetism, Volume 1CLASSICAL ELECTROMAGNETISM features a friendly, informal writing style. The text has received numerous accolades. |

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Page 379

ANSWER The wavelength A is much longer than the

approximation is okay. Then: k = w/ c = 2tt//c = 277r X 106/3 x 108 = 0.0209 m-1

RnA = 20.0 X (0.0209 X I)4 = 3.85 X 10~6fl = l2 X 3.85 X 10~6 = 3.85 /LiW For the

...

ANSWER The wavelength A is much longer than the

**antenna**, so the dipoleapproximation is okay. Then: k = w/ c = 2tt//c = 277r X 106/3 x 108 = 0.0209 m-1

RnA = 20.0 X (0.0209 X I)4 = 3.85 X 10~6fl = l2 X 3.85 X 10~6 = 3.85 /LiW For the

...

Page 385

If we place two half-wave

of the paper, separated by a distance A/ 2, and we drive them in phase, then for

an observer in the plane of the paper, as shown, the fields from the two

...

If we place two half-wave

**antennas**next to each other, Figure 15.11, in the planeof the paper, separated by a distance A/ 2, and we drive them in phase, then for

an observer in the plane of the paper, as shown, the fields from the two

**antennas**...

Page 386

Director Reflector Figure 15.14 Yagi

from B toward A will tend to be canceled by A. The pair of

more to the right than the left, and correspondingly as receiving

will ...

Director Reflector Figure 15.14 Yagi

**antenna**. entry, whereas a crest that startsfrom B toward A will tend to be canceled by A. The pair of

**antennas**will radiatemore to the right than the left, and correspondingly as receiving

**antennas**theywill ...

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### Contents

Vector Analysis | 1 |

Electric Field EGausss Law | 33 |

Magnetic Field BAmperes Law | 66 |

Copyright | |

17 other sections not shown

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### Common terms and phrases

acceleration Ampere's law angular ANSWER antenna atom axis Biot-Savart Biot-Savart law C7 EXAMPLE calculate capacitance capacitor charge density charge Q circuit component conducting conductor constant coordinates Coulomb's law curl current density cylinder dA/dt dielectric differential direction distance divergence divergence theorem electric dipole electric field electromagnetic electrons electrostatic Faraday's law field lines Figure Find the field flux frequency Gauss's law inductance inductor infinite inside integral Laplace's equation line charge loop Lorentz force Lorentz transformation magnetic dipole magnetic field magnetic monopoles Maxwell's equations meter momentum moving negative parallel perpendicular plane plasma plates polarization positive potential Poynting's vector primed frame Problem proton radiation radius reference frame relative relativistic resistor right-hand rule rotation scalar Section solenoid sphere spherical stationary surface charge theorem tion unit V X A V X B V X E velocity voltage waveguide wire zero