A long coaxial cable of length L=100m consists of an inner conductor of radius a=0.5mm and an outer shielding of radius b=1.5mm. The space between them is filled with a leaky dielectric material with resistivity ρ=2.0×1010Ω⋅m. Determine the 'leakage resistance' (radial resistance) allowing current to flow from the inner core to the shield. (Use ln(3)≈1.1).