A magnetic field strength of 5 µA/m is required at a point on 0 = n=2, 2 km from an antenna in air. Neglecting ohmic loss, how much power must the antenna transmit if it is: (a) An infinitesimal dipole with length A=50 (b) A dipole of I = 1:5À (c) A half-wave dipole (d) A quarter-wave monopole

A magnetic field strength of 5 µA/m is required at a point on 0 = n=2, 2 km from an antenna in air. Neglecting ohmic loss, how much power must the antenna transmit if it is: (a) An infinitesimal dipole with length A=50 (b) A dipole of I = 1:5À (c) A half-wave dipole (d) A quarter-wave monopole

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

Dielectric Breakdown

A dielectric is a material with low electrical conductivity and so is classified as an insulator. Dielectric materials are used to block the flow of electricity through them, allowing them to behave as an insulators. They can also be used to store electric charge or improve capacitance.Dielectrics have no free electrons for conduction because electrons are tightly bound to the nucleus. Because dielectrics contain a small number of electrons for electrical conductivity, they have a dipole. The two primary roles of dielectrics in electrical devices are insulation and electrical energy storage. An electric field polarizes the dielectric, and the polarization of the molecules allows dielectric materials to store charge.

Question

A magnetic field strength of 5 HA/m is required at a point on 0 = n=2, 2 km
from an antenna in air. Neglecting ohmic loss, how much power must the
antenna transmit if it is:
(a) An infinitesimal dipole with length A=50
(b) A dipole of I = 1:5A
(c) A half-wave dipole
(d) A quarter-wave monopole

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