centre of the cable, positively charged with linear charge density
= 9.0 x 10-9 C/m. It has a rubber coating (dielectric constant r
= 2.0, relative permeability r = 3.8) of inner radius a = 0.5 mm
and outer radius b = 0.9 mm, and an air gap exist between the core
wire and the rubber coating. (see Figure 1).
- 1 A Coaxial Cable Has A Thin Conducting Copper Wire At The Centre Of The Cable Positively Charged With Linear Charge D 1 (24.13 KiB) Viewed 55 times
(a). Calculate the electric field magnitude (with correct unit)
at radial distance from the copper wire r = 0.3 mm (air). Use three
significant figures.
(b). Calculate the electric field magnitude (with correct unit)
at radial distance from the copper wire r = 0.8 mm (rubber). Use
three significant figures.
(c). Calculate the electric field magnitude (with correct unit)
at radial distance from the copper wire r = 1.4 mm (air). Use three
significant figures.
(d). Plot the magnitude of the E field E(r) with respect to r,
from 0 to r = 1.4 mm, specifying all the discontinuities. [4]
(e). Based on the results in (d), plot a qualitative potential
function V(r) with respect to r, from r = 0.3 mm to r = 1.4 mm,
with reference 0 V at r =1.4 mm, i.e., V(r =1.4 mm) = 0. [4]
λ (C/m) Rubber- L