Final answer:
High-voltage wires are indeed held up by insulating connectors but are commonly not wrapped in insulating material since the surrounding air acts as an insulator. The statement regarding electric-field lines around a positive point charge being radial and pointing outward is true, indicating the repulsion of like charges.
Step-by-step explanation:
Understanding High-Voltage Wires and Electric Field Lines
The statement about high-voltage wires being held aloft by insulating connectors is true. These wires are indeed connected to tall metal-frame towers, elevated from the ground for safety reasons. The connectors used to hold these wires are designed to be insulators to prevent the transfer of electricity that could lead to dangerous situations or power losses. However, the part of the statement that says these wires are wrapped in an insulating material is commonly false. High voltage transmission lines are typically bare and not covered in an insulating layer because the air around them acts as an insulator and the height of the towers prevents people and wildlife from coming into contact with the wires.
Regarding the electric-field lines from a positive point charge, it is true that they spread out radially and point outward. This is because the electric field lines are used to represent the direction of force that a positive test charge would experience in the presence of the field. Since like charges repel, the field lines point away from a positive charge, indicating that another positive charge would be repelled in those directions.