True

Attenuation refers to the reduction in the amplitude or intensity of a signal as it travels through a medium. In the case of a dielectric, which is an insulating material, attenuation occurs due to various factors such as resistive losses, dielectric losses, and radiation losses. These losses are responsible for the dissipation of energy and the decrease in signal strength.

Resistive Losses:
When an electric field is applied to a dielectric material, it causes the movement of charges within the material. This movement results in the generation of heat due to the resistance of the material. As a result, some energy is lost in the form of heat, leading to attenuation.

Dielectric Losses:
Dielectric materials have an inherent property called dielectric loss, which causes the dissipation of energy in the form of heat. This loss is primarily due to the polarization of the dielectric material under the influence of the electric field. The polarization leads to the alignment of the dipoles within the material, resulting in energy losses and attenuation.

Radiation Losses:
When a signal passes through a dielectric material, it may also experience radiation losses. These losses occur when the electric and magnetic fields of the signal interact with the surrounding environment, causing energy to be radiated away from the dielectric. These radiated fields lead to a decrease in signal strength and contribute to attenuation.

Therefore, in a good dielectric, the attenuation will be non-zero due to the combined effect of resistive losses, dielectric losses, and radiation losses. These losses result in the dissipation of energy, leading to a reduction in the signal amplitude or intensity as it propagates through the dielectric material.