Final answer:
Soldering is a common method for joining wires, but not always the best. High-voltage wires are held aloft by insulators but are not insulated themselves. In circuit diagrams, voltage is not the same everywhere, and touching polarized objects does not automatically depolarize them.
Step-by-step explanation:
The statement that soldering is the best method of joining wires and terminals can be true or false depending on the context. While soldering is commonly used for creating a permanent and conductive connection between components in electronic devices, it may not be the 'best' method in every situation. For example, in high-vibration environments or where disassembly is required, other methods such as crimping might be preferable.
Turning to the student's question about the high-voltage wires, the statement is false. High-voltage wires are indeed held aloft by insulating connectors but they are not wrapped in insulating material. Instead, they are left bare because the surrounding air acts as an insulator and wrapping them would be impractical due to their size and the high voltages involved.
As for the question regarding circuit diagrams, it is false that voltage is the same at every point in a given wire. The voltage may drop across components in a circuit, so it can differ at various points along the wire.
In the context of polarization of insulating objects, it is also false to say that simply touching two polarized objects together will cancel their polarization. Polarization involves a separation of charges and merely touching the objects does not necessarily redistribute these charges to neutralize the polarization.