Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (3rd Edition)

Published by Pearson
ISBN 10: 0321740904
ISBN 13: 978-0-32174-090-8

Chapter 34 - Electromagnetic Fields and Waves - Conceptual Questions - Page 1028: 9

Answer

An older television with a loop antenna works by using a loop of wire to pick up the electromagnetic waves that carry the television signal. The loop antenna is designed to be resonant at the frequency of the television signal, which means it can effectively "tune in" to the signal by resonating with it. The loop antenna is connected to the television's tuner, which amplifies the signal and converts it into a form that can be displayed on the screen.

Work Step by Step

The loop antenna works by acting as a conductor for the electromagnetic waves. When the waves pass through the loop, they create an oscillating electric field that causes the electrons in the wire to move back and forth. This movement of the electrons produces an alternating current (AC) in the loop, which is then picked up by the tuner and used to create the television signal. The size and shape of the loop antenna can affect its sensitivity and ability to pick up the signal, and the orientation of the loop relative to the source of the signal can also have an impact on the strength of the signal received.
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