Final answer:
Suspension type insulators are used in high voltage transmission lines where there is a change in the direction or the line is dead-ended. High-voltage wires are held by insulating connectors, not wrapped in an insulating material, making that statement false. Lenz's Law dictates the direction of induced current in response to changes in a magnetic field.
Step-by-step explanation:
Whenever the conductors are dead-ended or there is a change in the direction of the transmission line, the insulators used are typically of the suspension type. These insulators are designed to carry the weight of the conductor and allow for movement due to thermal expansion, wind, and other environmental factors. Different types of insulators serve specific purposes in electrical systems: pin type insulators are generally used for low voltage lines; suspension type are used for high voltage lines where flexibility is important; stram type insulators are a variation of suspension insulators; and shackle type insulators are used for strain insulators in rural areas.
High-voltage wires connected to metal-frame towers are not wrapped in an insulating material; rather, they are held aloft by insulating connectors. Therefore, this statement is false. Insulators must be used carefully because they form a critical part of the infrastructure that supports the safe transfer of electrical energy.
The direction of the current induced in a circular conducting loop, according to Lenz's Law, is such that it will oppose the change in magnetic flux that produced it. Therefore, when a switch is closed, the current is induced in one direction and when the switch is opened, the current is induced in the opposite direction.
High-voltage transmission lines are designed with smooth surfaces to prevent the leakage of charge into the air. Also, Faraday cages use these principles to protect enclosed equipment from external electrical charges by redistributing the charges on the external surface of the cage.