A coaxial cable used in a transmission line has an inner radius of 0.076 mm and an outer radius of 0.89 mm. Calculate the capacitance per meter for the cable. ASsume that the space between the conductors is filled with a material with a dielectric constant of 2.8.
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Water constitutes about 70% of earth. Some important distinguishing properties of water are high molar concentration, small dissociation constant and high dielectric constant.
Electrostatic Potential and Capacitance
An electrostatic force is a force caused by stationary electric charges /fields. The electrostatic force is caused by the transfer of electrons in conducting materials. Coulomb’s law determines the amount of force between two stationary, charged particles. The electric force is the force which acts between two stationary charges. It is also called Coulomb force.
for coaxial cylindrical capacitor
capacitance per meter C=
where k = dielectric constant
= permittivity of free space = 8.85*10-12 F/m
b= radius of outer cable
a = radius of inner cable
given
a=0.076mm b = 0.89mm k =2.8
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