Which of these is not an application of electromagnetic induction? A) Radio.B) None of these.C) Sound.D) Light.E) All of these are
C) Sound
To determine which of these options is not an application of electromagnetic induction, let's go through each one:
A) Radio: Radio waves are a form of electromagnetic radiation, and they are used extensively in communication systems. These communication systems rely on electromagnetic induction to transmit and receive signals. Therefore, radio is an application of electromagnetic induction.
C) Sound: Sound is produced by mechanical vibrations and does not involve electromagnetic induction. Therefore, sound is not an application of electromagnetic induction.
D) Light: Light is an electromagnetic wave, and our understanding of light and its properties is based on the principles of electromagnetism. Various technologies and applications, such as lasers and fiber optics, rely on electromagnetic induction for their operation. Therefore, light is an application of electromagnetic induction.
E) All of these are: This option suggests that all of the listed applications (radio, sound, and light) are applications of electromagnetic induction. However, since sound is not an application of electromagnetic induction, this option is incorrect.
Therefore, the correct answer is C) Sound, as it is not an application of electromagnetic induction.