Final answer:
The claim about high-voltage wires being wrapped in an insulating material is false since they are not wrapped but maintained insulated via air gaps. Conversely, the statement about electric-field lines spreading out radially and pointing outward from a positive point charge is true.
Step-by-step explanation:
The question regarding the nature of high-voltage wires and the orientation of electric-field lines from a positive point charge pertains to concepts in Physics, specifically within the domain of electromagnetism. To clarify, here are the true or false statements with detailed explanations:
The statement that high-voltage wires wrapped in insulating material is false. High-voltage wires, also known as transmission lines, are typically made of aluminum or copper and are not wrapped in insulating material because they carry electricity at high voltages. If they were covered with insulation, the size and weight would make them impractical to support. The wires are kept at a considerable distance from each other and from the ground using insulating connectors attached to tall metal-frame towers. This air gap acts as a natural insulator preventing the electricity from arcing to the towers or the ground.
The statement that the electric-field lines from a positive point charge spread out radially and point outward is true. Electric-field lines are a visual representation of the direction and strength of the electric field around a charged particle. For a positive point charge, these lines radiate outwards from the charge, illustrating how a positive test charge would move in the presence of this field.