Explain Hertz experiment for communication of electromagnetic waves. Draw labelled diagram of apparatus used in the experiment. $(or)$ Explain Hertz experiment related with electromagnetic waves and also explain experiments of Jagdish Chandra Basu and Marconi. $(or)$ Critically evaluate Hertz experiment of production and communication of electromagnetic waves.
Source of magnetic field is not only electric current generated due to flow of charge but also rate of change of displacement vector or electric field vector with time. Justify the statement and prove that$i=i_c+i_d=i_c+\epsilon_0 \frac{d \phi_{E}}{d t}$