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 |
If an electromagnetic wave of frequency f = 3 MHz passes from vacuum into a dielectric medium with relative permittivity K= 4.0, then:
1. | wavelength is 2 times and frequency becomes half |
2. | wavelength is half and frequency remains unchanged |
3. | wavelength and frequency both remain unchanged |
4. | None of the above |
A larger parallel plate capacitor, whose plates have an area of 1 , 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
2. 11
3. 2.2
4. 1.1
The most penetrating radiation out of the following is:
1. x-rays
2. β-rays
3. -rays
4. γ-rays
Which of the following statements is false regarding the properties of electromagnetic waves?
1. | Both electric and magnetic field vectors attain the maxima and minima at the same place and the same time |
2. | The energy in an electromagnetic wave is divided equally between electric and magnetic vectors |
3. | Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of the wave |
4. | These waves do not require any material medium for propagation |
The speed of an electromagnetic wave in a medium of dielectric constant 2.25 and relative permeability 4 is approximately:
1. 1 x 108 m/s
2. 2.5 x 108 m/s
3. 3 x 108 m/s
4. 2 x 108 m/s
In an electromagnetic wave, energy density associated with a magnetic field will be:
1.
2.
3.
4.
The figure shows a parallel plate capacitor being charged by a battery. If X and Y are two closed curves then during charging, is zero along the curve:
1. | X only |
2. | Y only |
3. | Both X & Y |
4. | Neither X nor Y |
A plane electromagnetic wave travels in free space along x-axis. At a particular point in space, the electric field along y-axis is 9.3 . The magnetic induction is:
1.
2.
3.
4.
Light is a kind of wave. The wavelength of visible light ranges from about 4000 \(\overset{o}{A}\) to 7000 \(\overset{o}{A}\). Which of the following statements is false?
1. | \(\overset{o}{A}\) | Ultraviolet light has a wavelength shorter than 4000
2. | Infrared light has a wavelength longer than 7000 \(\overset{o}{A}\) |
3. | Red light has a wavelength near about 7000 \(\overset{o}{A}\) |
4. | Violet light has a wavelength near about 7000 \(\overset{o}{A}\) |