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CBSE Class 8 Answered

Why lightning does not get in the soil
Asked by vilaspatil77 | 27 Sep, 2023, 04:06: PM
answered-by-expert Expert Answer
Once the negative charge at the bottom of the cloud gets large enough, a flow of negative charge called a stepped leader rushes toward the Earth. The positive charges at the ground are attracted to the stepped leader, so positive charge flows upward from the ground.
When lightning hits ground it is called cloud-to-ground lightning. 
 
A lightning conductor is a long pointed metal rod fixed on top of the building that is to be protected. 
The lower end of the lightning conductor is connected to a metal plate which is buried deep inside the earth with the help of a conducting wire. This is called as the earthing.  In rainy season, the roofs of the tall buildings and monuments become wet, so they become good conductors of electricity.
 By induction, the upper part of the building i.e. the roof acquires opposite charge (negative charge) and this charge moves to the earth through the earthing system.
 If the building does not have any earthing system, the large force of attraction between the positively charged clouds and the negatively charged roof of the building will attract the charge from the cloud to the building which may cause fire and damage the building. 
Answered by Shiwani Sawant | 08 Oct, 2023, 08:13: PM

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CBSE 8 - Science
Mam/Sir i also came across another question saying that Which of the following does not conduct electricity? vineger solution sugar solution  lemon juice  solution caustic soda solution shouldn 't it be viniger and sugar.But the ans to this it says sugar solution as electricity vannoth pass through both vineger and sugar solution
Asked by desaitd | 06 Jan, 2024, 10:38: AM
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CBSE 8 - Science
Why lightning does not get in the soil
Asked by vilaspatil77 | 27 Sep, 2023, 04:06: PM
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CBSE 8 - Science
an electric current is passed through a conducting solution.list any three possible observation
Asked by vasudevasrinivasan | 18 Mar, 2023, 12:46: PM
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CBSE 8 - Science
gain ectrons to form negative ions
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what is electroplating?
Asked by suveer20052411 | 21 Feb, 2019, 11:09: PM
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Why should materials not be classified as insulators? Can you suggest a more appropriate term instead of 'insulator'?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 8 - Science
If a bulb based tester shows no deflection, what possible conclusions can be drawn? How will you check which of these is actually the correct conclusion.
Asked by Topperlearning User | 22 Nov, 2013, 02:38: AM
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CBSE 8 - Science
Mention three common solutions that are good conductors of electric current. What is common in these solutions?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 8 - Science
Distilled water is a poor conductor of electric current. Then why should we never touch electrical appliances with wet hands?
Asked by Topperlearning User | 13 May, 2014, 04:25: PM
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CBSE 8 - Science
Can a solution, which is a poor conductor of electricity according to our testers, ever allow electric current to pass through it? Give a common example.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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