Question 1 :
Identify which of the following is NOT a characteristic of electromagnetic waves?<br/>
Question 5 :
According to Maxwell's equation, the velocity of light in any medium is expressed as
Question 7 :
Which of the following is the right derivation for Ampere-Maxwell law?
Question 8 :
Which wave characteristic describes the product of the frequency and the wavelength?
Question 9 :
Instantaneous displacement current $1A$ in the space between the parallel plates of $1\mu F$ capacitor can be established by changing the potential difference at the rate of:<br/>
Question 11 :
According to the electromagnetic wave theory, light consists of electric and magnetic fields which are __________.
Question 12 :
Maxwell in his famous equations of electromagnetism, introduced the concept of
Question 14 :
The capacity of a parallel plate air capacitor is $2 \mu F$ and voltage between the plates is changing at the rate of $3 {V}/{S}$. The displacement current in the capacitor is:
Question 15 :
Assertion: The electromagnetic wave is transverse in nature.
Reason: Electromagnetic wave propagates parallel to the direction of electric and magnetic fields.
Question 17 :
Two opposite charged particles oscillate about their mean equilibrium position in free space, with a frequency of ${10}^{9}Hz$. The wavelength of the corresponding electromagnetic wave produced is ______
Question 19 :
Assertion: Dipole oscillations produce electromagentic waves,<br>Reason : Accelerated charge produceselectromagnetic waves
Question 20 :
One requires 11eV of energy to dissociate of carbon monoxide molecule into carbon and oxygen atoms. The minimum frequency of the appropriate electromagnetic radiation to achieve the dissociation lies in:
Question 21 :
A free electron is placed in the path of a plane electromagnetic wave. The electron will start moving
Question 22 :
In an electromagnetic wave, the electric and magnetic fields are $100 Vm ^{-1}$and $0.265 Am$ maximum energy flow is
Question 23 :
A parallel beam of light is incident normally on a plane surface absorbing 40 % of the light and reflecting the rest. If the incident beam carries 60 watt of power, the force exerted by it on the surface is:
Question 24 :
A $1.5\ kW$ (kilo-watt) laser beam of wavelength $6400 \mathring A$ is used to levitate a thin aluminium disc of same area as the cross section of the beam. The laser light is reflected by the aluminium disk without any absorption. The mass of the disc is close to:<br/>
Question 25 :
If the magnetic field of a plane electromagnetic wave is given by (The speed of light $= 3\times 10^{8}/ m/s) B = 100\times 10^{-6} \sin \left [2\pi \times 2\times 10^{15} \left (t - \dfrac {x}{c}\right )\right ]$ then the maximum electric field associated with it is
