A single core, 2 km cable has a conductor radius of 10 mm and an insulation thickness of 17.18 mm. If the resistivity of dielectric is 6.28 × 10^12 Ωm, the insulation resistance of the cable is:
- A. 2000 MΩ
- B. 4000 MΩ
- C. 5000 MΩ
- D. 6000 MΩ
Answer: C. 5000 MΩ
Explanation: Insulation resistance of a single core cable R = (ρ / 2πl) ln(r2/r1). Substituting the given dimensions gives 5000 MΩ.