Consider the force of an electromagnetic wave on the electrons in an antenna. Assume the amplitude of
Question:
Consider the force of an electromagnetic wave on the electrons in an antenna. Assume the amplitude of the electric field associated with the wave is E0 = 200 V/m.
(a) What is the magnitude of the electric force on an electron? Express your answer in terms of e and E0, and in newtons using the given value of E0.
(b) What is the magnitude of the magnetic force on an electron in the antenna? Express your answer in terms of e, B0 (the magnetic field amplitude), and the speed v of the electron.
(c) Suppose v is the drift velocity of an electron. In Chapter 19 (Section 19.3), we found that for typical values of the current the drift velocity is about 0.01 m/s. What is the magnetic force on the electron? What is the ratio of the magnetic force to the electric force found in part (a)?
(d) At what speed v does the magnetic force on an electron equal the electric force?
Step by Step Answer:
College Physics Reasoning and Relationships
ISBN: 978-0840058195
2nd edition
Authors: Nicholas Giordano