A larger parallel plate capacitor, whose plates have an area of \(1~\text{m}^2,\) separated from each other by \(1\) mm, is being charged at a rate of \(25.8\) V/s.
If the plates have dielectric constant \(10\), then the displacement current at this instant is:
1. \(25~\mu\text{A}\)
2. \(11~\mu\text{A}\)
3. \(2.2~\mu\text{A}\)
4. \(1.1~\mu\text{A}\)
A parallel plate capacitor with plate area \(A\) and separation between the plates \(d\), is charged by a source having current \(i\) at some instant. Consider a plane surface of area \(A/2\) parallel to the plates and drawn symmetrically between the plates. The displacement current through this area is:
1. \(i\)
2. \(i/2\)
3. \(i/4\)
4. \(i/8\)
The sun delivers \(10^{3}~\text{W/m}^2\) of electromagnetic flux to the earth's surface. The total power that is incident on a roof of dimensions \(8\) m\(20\) m will be:
1. \(2.56\times 10^{4}~\text{W}\)
2. \(6.4\times 10^{5}~\text{W}\)
3. \(4.0\times 10^{5}~\text{W}\)
4. \(1.6\times 10^{5}~\text{W}\)
In an electromagnetic wave, if the electric field oscillated sinusoidally with an amplitude of \(48~\text{Vm}^{-1}\), then the RMS value of the oscillating magnetic field will be:
1. \(1.6\times 10^{-8}~\text{T}\)
2. \(1.6\times 10^{-9}~\text{T}\)
3. \(144\times 10^{-8}~\text{T}\)
4. \(11.3\times 10^{-8}~\text{T}\)
The speed of an electromagnetic wave in a medium of dielectric constant \(2.25\) and relative permeability \(4\) is approximately:
1. \(1\times 10^{8}\) m/s
2. \(2.5\times 10^{8}\) m/s
3. \(3\times 10^{8}\) m/s
4. \(2\times 10^{8}\) m/s
The frequency \(1057~\text{MHz}\) of radiation arising due to electron transition between two close energy levels in hydrogen belongs to:
1. radio waves
2. infrared waves
3. microwaves
4. \(\gamma\text-\)rays
In an electromagnetic wave:
1. | power is transmitted along the magnetic field. |
2. | power is transmitted along the electric field. |
3. | power is equally transferred along with the electric and magnetic fields. |
4. | power is transmitted in a direction perpendicular to both the fields. |
A parallel plate capacitor consists of two circular plates each of radius \(2~\text{cm}\), separated by a distance of \(0.1~\text{mm}\). If the voltage across the plates is varying at the rate of \(5\times10^{13}~\text{V/s}\), then the value of displacement current is:
1. \(5.50~\text{A}\)
2. \(5.56\times 10^{2}~\text{A}\)
3. \(5.56\times 10^{3}~\text{A}\)
4. \(2.28\times 10^{4}~\text{A}\)
1. | Moving along \(y\text-\)direction with frequency \(2\pi\times 10^6~\text{Hz}\) and wavelength \(200\) m. |
2. | Moving along \(+x\text-\)direction with frequency \(10^6~\text{Hz}\) and wavelength \(100\) m. |
3. | Moving along \(+x\text-\)direction with frequency \(10^6~\text{Hz}\) and wavelength \(200\) m. |
4. | Moving along \(-x\text-\)direction with frequency \(10^6~\text{Hz}\) and wavelength \(200\) nm. |
The decreasing order of the wavelength of infrared, microwave, ultraviolet and gamma rays is:
1. | Gamma rays, ultraviolet, infrared, microwaves |
2. | Microwaves, gamma rays, infrared, ultraviolet |
3. | Infrared, microwave, ultraviolet, gamma rays |
4. | Microwave, infrared, ultraviolet, gamma rays |