(a) Differentiate between 'conduction current' and 'displacement current', giving one similarity and one dissimilarity between them. (b) Explain the…

Both give rise to magnetic field.

A magnetic field, changing with time, gives rise to an electric field. Then, an electric field changing with time gives rise to a magnetic field and is a consequence of the displacement current being a source of a magnetic field. Thus, time-dependent electric and magnetic fields give rise to each other and hence em wave is generated.

$$\oint \vec{B}\cdot\vec{dl} = \mu_0 I_c + \mu_0 \varepsilon_0 \frac{d\Phi_e}{dt}$$