Advertisements
Advertisements
प्रश्न
Electromagnetic waves are produced by
पर्याय
a static charge
a moving charge
an accelerating charge
chargeless particles
उत्तर
an accelerating charge
A static charge produces an electrostatic field. A moving charge produces a magnetic field. Electromagnetic waves are produced by an accelerating charge.
APPEARS IN
संबंधित प्रश्न
A metal rod is placed along the axis of a solenoid carrying a high-frequency alternating current. It is found that the rod gets heated. Explain why the rod gets heated.
A magnetic field can be produced by
A compass needle is placed in the gap of a parallel plate capacitor. The capacitor is connected to a battery through a resistance. The compass needle
Dimensions of 1/(µ0ϵ0) is
An electric field `vec E` and a magnetic field `vec B` exist in a region. The fields are not perpendicular to each other.
Consider the following two statements regarding a linearly polarised, plane electromagnetic wave :
(A) The electric field and the magnetic field have equal average values.
(B) The electric energy and the magnetic energy have equal average values.
A plane electromagnetic wave is incident on a material surface. The wave delivers momentum p and energy E.
An electromagnetic wave going through vacuum is described by
E = E0 sin (kx − ωt).
Which of the following is/are independent of the wavelength?
Show that the dimensions of the displacement current `∈_0 (d varphi_E)/dt` are that of an electric current .
Using B = µ0 H, find the ratio E0/H0 for a plane electromagnetic wave propagating through vacuum. Show that it has the dimensions of electric resistance. This ratio is a universal constant called the impedance of free space.
The sunlight reaching Earth has maximum electric field of 810 Vm−1. What is the maximum magnetic field in this light?
The magnetic field in a plane electromagnetic wave is given by
B = (200 µT) sin [(4.0 × 1015s−1)(t−x/c)].
Find the maximum electric field and the average energy density corresponding to the electric field.
The intensity of the sunlight reaching Earth is 1380 W m−2. Assume this light to be a plane, monochromatic wave. Find the amplitudes of electric and magnetic fields in this wave.
Electromagnetic waves are transverse in nature as evident by ______
