Question

State the principle of production of e.m. waves.​

Answer 1

$\red{\textbf{Answer}}$

$\blue{\textbf{principle of production of e.m. waves}}$:-

______________________________________

$\textbf{An electric charge}$ at rest has no magnetic field but only electric field around it. A moving charge with a constant velocity has both, the $\textbf{electric as well as magnetic field}$ around it. But as the current is not changing with time, so magnetic field will also be constant .

hence ,

$\blue{\texttt{no e.m.waves will be produced. }}$

If the $\textbf{charge}$ is moving with some $\textbf{acceleration}$, both electric and magnetic field will be changed

hence, $\blue{\texttt{e.m.waves are produced}}$.

Thus, the accelerated charge produces both electric and magnetic fields which vary both in $\textbf{space and time}$. These varying electric and magnetic fields give rise to e.m.waves.

$\red{\texttt{The speed of e.m. waves in vacuum }}$is ,

$3 \times {10}^{3} m {s}^{ - 1}$

Answer 2

A charged particle produces an electric field. This electric field exerts a force on other charged particles. Positive charges accelerate in the direction of the field and negative charges accelerate in a direction opposite to the direction of the field.