What is a coaxial cable?

What is the function of copper mesh in coaxial cable?

The inner and outer radii of a coaxial cable are 0.1 mm and 0.6 mm respectivley.If the core material has dielectric constant 12, calculate the capacitance per metre of the cable.

a current I flows upwards along the inner conductor of a co-axial cable and returns down along the external shel of the cable shown in the figure what is the intensity of the magnitude field at points inside the cable?

What is meant by line communication? Give any four advantages of coaxial cables.

If (1, 2) is a limiting point of a coaxial system of circles containing the circle x^(2)+y^(2)+x-5y+9=0 , then the equation of the radical axis, is