Final answer:
While the correct answer to the spacing between conductors on building exteriors is 150 mm, the provided details discuss a different topic: a 240-kV power transmission line supported by insulators from a grounded metal tower.
Step-by-step explanation:
The question appears to be related to the spacing of electrical conductors on the exterior surfaces of buildings. The correct answer to the student's original question about the minimum spacing between individual conductors on the exterior of buildings is '150 mm,' which corresponds to option B. However, the information provided regarding a 240-kV power transmission line carrying 5.00 × 10² A hanging from a grounded metal tower does not directly relate to the question about the separation of conductors on building surfaces.
In addressing the given information, it's clear that the details are from a discussion related to electrical engineering, specifically about the transmission of electrical power and the usage of insulators. The insulators mentioned, each with a resistance of 1.00 × 10¹ Ω, are critical to ensure the safe operation of high-voltage transmission lines by preventing electricity from passing to the grounded transmission towers.