Show that the magnetic field B at a point in between the plates of a parallel-plate capacitor during charging is (symbols having usual meaning).

Poynting vectors S is defined as a vector whose magnitude is equal to the wave intensity and whose direction is along the direction of wave propagation. Mathematically, it is given by Show the nature of S vs t graph.

Professor C.V Raman surprised his students by suspending freely a tiny light ball in a transparent vacuum chamber by shining a laser beam on it. Which property of EM waves was he exhibiting? Give one more example of this property.

Electromagnetic waves with wavelength

(i) λ₁ is used in satellite communication.

(ii) λ₂ is used to kill germs in water purifies.

(iii) λ₃ is used to detect leakage of oil in underground pipelines.

(iv) λ₄ is used to improve visibility in runways during fog and mist conditions.

(a) Identify and name the part of electromagnetic spectrum to which these radiations belong.

(b) Arrange these wavelengths in ascending order of their magnitude.

(c) Write one more application of each.

Show that average value of radiant flux density ‘S’ over a single period ‘T’ is given by .