Consider a parallel plate capacitor which is connected to an 230 V RMS value and 50 Hz frequency. If the separation distance between the plates of the capacitor and area of the plates are 1 mm and 20 cm² respectively. Calculate the displacement current at t = 1 s.

A magnetron in a microwave oven emits electromagnetic waves (em waves) with frequency f = 2450 MHz. What magnetic field strength is required for electrons to move in circular paths with this frequency?

A pulse of light of duration 10⁻⁶ s is absorbed completely by a small object initially at rest. If the power of the pulse is 60\(\times\) 10⁻³ W. Calculate the final momentum of the object.

Let an electromagnetic wave propagate along the x-direction, the magnetic field oscillates at a frequency of 10¹⁰ Hz and has an amplitude of 10⁻⁵ T, acting along the y-direction. Then, compute the wavelength of the wave. Also write down the expression for electric field in this case.

If the relative permeability and relative permittivity of a medium are 1.0 and 2.25 respectively, find the speed of the electromagnetic wave in this medium.

Write short notes on
(a) microwaves
(b) X - rays
(c) Radio waves
(d) Visible spectrum

Write down the properties of electromagnetic waves.

Give two uses each of
(i) IR radiation,
(ii) Microwaves and
(iii) UV radiation.

What are Fraunhofer lines? How are they useful in the identification of elements present in the Sun?