In an electric circuit, there is a capacitor of reactance 100 connected across the source of 220 V. The rms value of displacement current will be:
1. 2.2 A
2. 0.22 A
3. 4.2 A
4. 2.4 A
An electromagnetic radiation has an energy \(14.4~\text{keV}\). To which region of the electromagnetic spectrum does it belong?
1. | Infrared region |
2. | Visible region |
3. | X-ray region |
4. | \(\gamma\)- ray region |
The velocity of electromagnetic wave is parallel to:
1.
2.
3.
4.
Displacement current is the same as:
1. | Conduction current due to the flow of free electrons |
2. | Conduction current due to the flow of positive ions |
3. | Conduction current due to the flow of both positive and negative free charge carriers |
4. | It is not a conduction current but is caused by the time-varying electric field |
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.
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.