Explain the following with reference to magnetostatics: (i) diamagnetic material; (ii) lossy media. State three methods of electromagnetic shielding. State the ponyting's theorem. A 180 mHz plane wave travels in a medium characterised by: mur=1, r=20 sigma=2mS/m. Determine the: (i) loss tangent hence state type of conductor media; (ii) intrinsic impedance; (iii) attenuation constant; (iv) skin depth.

Question

Explain the following with reference to magnetostatics: (i) diamagnetic material; (ii) lossy media. State three methods of electromagnetic shielding. State the ponyting's theorem. A 180 mHz plane wave travels in a medium characterised by: mur=1, r=20 sigma=2mS/m. Determine the: (i) loss tangent hence state type of conductor media; (ii) intrinsic impedance; (iii) attenuation constant; (iv) skin depth.

Asked on March 26, 2026Physics

This physics problem tests your understanding of fundamental physical laws and their applications. The step-by-step solution below breaks down the problem using relevant equations and physical reasoning.

Accepted Answer · 2026-03-26T06:42:51.840Z

a) (i) A diamagnetic material is a type of material that is weakly repelled by an external magnetic field. In magnetostatics, when placed in a magnetic field, diamagnetic materials develop an induced magnetic moment that opposes the applied field. This results in a relative permeability ($\mu_r$) slightly less than 1. All materials exhibit diamagnetism, but it is often masked by stronger forms of magnetism like paramagnetism or ferromagnetism. (ii) A lossy medium is a material in which electromagnetic energy is dissipated as heat as the wave propagates through it. This energy loss is primarily due to the conductivity ($\sigma$) of the medium, where free charges move and collide, converting electrical energy into thermal energy. In such a medium, the electromagnetic