The maxwell's equation:
is a statement of :
(1) Faraday's law of induction
(2) Modified Ampere's law
(3) Gauss's law of electricity
(4) Gauss's law of magnetism
The charge of a parallel plate capacitor is varying as . Find the magnitude of displacement current through the capacitor.
(Plate Area = A, separation of plates = d)
1.
2.
3.
4.
An electromagnetic wave is propagating along Y-axis. Then:
(1) The oscillating electric field is along X-axis and the oscillating magnetic field is along Y-axis.
(2) The oscillating electric field is along Z-axis and the oscillating magnetic field is along X-axis.
(3) Both oscillating electric and magnetic fields are along Y-axis, but the phase difference between them is
(4) Both oscillating electric and magnetic fields are mutually perpendicular in arbitrary directions.
In electromagnetic wave the phase difference between electric and magnetic field vectors is:
1. 0
2.
3.
4.
An electromagnetic wave going through the vacuum is described by
Which is the following is/are independent of the wavelength?
1. | \(k\) | 2. | \(k \over \omega\) |
3. | \(k \omega\) | 4. | \( \omega\) |
In a plane E.M. wave, the electric field oscillates sinusoidally at a frequency of 2.5 Hz and amplitude 480 V/m. The amplitude of the oscillating magnetic field will be:
1.
2.
3.
4.
The energy density of the electromagnetic wave in vacuum is given by the relation:
1.
2.
3.
4.
A lamp radiates power uniformly in all directions. The amplitude of electric field strength at a distance r from it is:
1.
2.
3.
4.
The intensity of visible radiation at a distance of 1 m from a bulb of 100 W which converts only 5% of its power into light, is:
1. 0.4 W/m2
2. 0.5 W/m2
3. 0.1 W/m2
4. 0.01 W/m2
On an EM wave, the amplitude of electric and magnetic fields are 100 v/m and 0.265 A/m. The maximum energy flow is
(1) 26.5 (2) 46.7
(3) 66.5 (4) 86.5