{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

HW24soln - 32.15 Fields from a Light Bulb We can reasonably...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Physics 21 Fall 2007 Solution to HW-24 Poynting Flux An electromagnetic wave travels through vacuum. Its electric field vector is given by E =E_0 sin( k x - ϖ t ) j . (A) If B_0 is the amplitude of the magnetic field vector, find the complete expression for the magnetic field vector B of the wave. B_0 sin( kx - ϖ t ) k (B) What is the Poynting vector S ( x,t ) (the power per unit area associated with the electromagnetic wave ? Satellite Television Transmission A satellite is in geostationary orbit at a height of 35,000 km above the surface of the earth and has an isotropic power output of 1 kW. (A) Reception devices pick up the electromagnetic wave sent out by the satellite. What is the amplitude E_0 of the electric field vector of the satellite broadcast as measured at the surface of the earth? (B) Suppose the satellite transmits television signals. You have a satellite TV reciever with a circular dish of radius R that focuses the electromagnetic energy incident from the satellite onto a receiver with a surface area of 5
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Ask a homework question - tutors are online