1. what is lightning ? What is lightning Conductor ? How does it works
2. what is electroscope ?
3. what is earthing ?
4. What is the rule of attraction of charges ?
5. Name any two safety measures during lightning when we are a) indoor b) Out door
6. How many charges are there ? What are they ?
Answers
Answer:
1.. Lightning conductor is a metal rod placed on a building and connected with the ground below to protect the building from being damaged by lightning. Its purpose is to offer a low resistance path to lightening and allow it to pass to the ground without impacting the building.
2..The electroscope is an early scientific instrument used to detect the presence of electric charge on a body. It detects charge by the movement of a test object due to the Coulomb electrostatic force on it. The amount of charge on an object is proportional to its voltage.
3..An earthing system or grounding system connects specific parts of an electric power system with the ground, typically the Earth's conductive surface, for safety and functional purposes. The choice of earthing system can affect the safety and electromagnetic compatibility of the installation.
4..According to Coulomb, the electric force for charges at rest has the following properties: Like charges repel each other; unlike charges attract. Thus, two negative charges repel one another, while a positive charge attracts a negative charge. The attraction or repulsion acts along the line between the two charges.
5.. indoor Avoid water during a thunderstorm. Lightning can travel through plumbing.
Avoid electronic equipment of all types. Lightning can travel through electrical systems and radio and television reception systems.
Avoid corded phones. ...
Avoid concrete floors and walls
outdoor If the weather forecast calls for thunderstorms, postpone your trip or activity.
Remember: When thunder roars, go indoors. ...
Don't forget the 30-30 rule. ...
If no shelter is available, crouch low, with as little of your body touching the ground as possible. ...
Stay away from concrete floors or walls.
6..two
Electric charge, which can be positive or negative, occurs in discrete natural units and is neither created nor destroyed. Electric charges are of two general types: positive and negative. Two objects that have an excess of one type of charge exert a force of repulsion on each other when relatively close together.