Question

Assertion: Dipole oscillations produce electromagnetic waves.
Reason: Accelerated charge produces electromagnetic waves.
A. If both assertion and reason are true but the reason is the correct explanation of assertion.
B. If both assertion and reason are true but the reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.
E. If the reason is true but the assertion is false.

Answer 1

Hint: Dipoles are a pair of two opposite charges separated by a small distance between them. If they perform oscillations they are moving and would result in a magnetic field and if this field is changing then, it would result in electromagnetic induction. All oscillations are accelerated motion. So, considering these facts we can decide the correct option among the given.

Complete answer:
An electric dipole is defined as a pair of equal and opposite charges separated by a small distance. The electric dipole moment is used to measure the strength of an electric dipole. The dipole moment of an electric dipole is a vector whose magnitude is either charge times the separation between the two opposite charges and the direction is along the dipole axis from the negative to the positive charge.
When an electric charge moves it gives rise to a magnetic field around it. This magnetic field is not uniform in nature. The phenomenon of production of induced emf and then induced current due to change in the magnetic flux linked with a closed circuit is called electromagnetic induction.
So, the oscillations of a dipole do result in the production of electromagnetic waves. Thus the assertion is true.

Now, according to Maxwell’s classical theory accelerated charges do produce electromagnetic waves. The oscillations of a dipole result in the production of radiations which occur because the charges in a dipole get accelerated while performing oscillations. So, the reason is also true and does explain the assertion.

So, the correct answer is “Option A”.

Note:
Faster is the oscillation of the dipole greater is the production of the magnetic field and thus the greater is their relative motion among the two fields. Thus resulting in larger electromagnetic induction and electromagnetic waves.