Final answer:
High-voltage wires on towers are not insulated, so the statement is false. In a circuit diagram, voltage is not the same at every point in a given wire, and it is true that even a single photon strike can create a current in a photoconductive cell. Automotive systems commonly use a chassis ground for electrical return, it is true that synapses often exist between a dendrite and an axon terminal, and dropping a bar magnet through a copper tube does induce a current.
Step-by-step explanation:
The high-voltage wires that you see connected to tall metal-frame towers are, in fact, typically not wrapped in any insulating material. They are held aloft by insulating connectors to prevent the current from grounding prematurely, but if they were wrapped in insulating material, the insulation would have to be very thick to handle the high voltage, making the wires impractical and excessively heavy. Therefore, the correct answer is:
Regarding a circuit diagram, it's false to assume that the voltage is the same at every point in a given wire. The voltage can drop across components in the circuit, so the potential at various points in the wire could differ depending on the circuit's layout. In a photoconductive cell, it is true that a current is created even when a single electron is expelled from a photon strike, as this can initiate the flow of electricity.
In cars, the connection of one battery terminal to the metal body creates a return path for the current through the vehicle's body itself, allowing for a single wire to complete the circuit to electrical devices. This method is known as a chassis ground and is widely used in automotive electrical systems.
As for synapses, it is true that they often exist where a dendrite and an axon terminal meet. However, it is false that there is only one axon terminal per neuron; neurons typically have multiple axon terminals that connect to other neurons through synapses.
If you drop a bar magnet through a copper tube, you induce an eddy current in the tube that opposes the magnet's motion according to Lenz's Law, which can be observed as a slowing down of the falling magnet. Thus, the correct answer here is:
For two polarized insulating objects, simply touching them together does not suffice to cancel the polarization if they are made of non-conductive material. Additional steps such as grounding may be required to remove the polarization. So the correct answer to this question is: