Lightning conductors are used to protect building from lightning strikes. Which of the following statements is / are true about lightning conductors? 1. Lightning conductors create an electric field at its top so that lightning strikes it preferentially 2

examrobotsa's picture

Submitted by examrobotsa on

Q: 8 (NDA-II/2015)
Lightning conductors are used to protect building from lightning strikes.
Which of the following statements is / are true about lightning conductors?
1. Lightning conductors create an electric field at its top so that lightning strikes it preferentially
2. Li ghtni ng conductors reduce the effect of the strike by uniformly distributing the charge (current) over the surface of the building
3. Lightning conductors take all charge (current) to deep down in the earth
4. Lightning conductors must be installed at a place taller than the building
Select the correct answer using the code given below:

question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,19,27,6,21,19,0

keywords: 

{'lightning conductors': [0, 0, 0, 1], 'li ghtni ng conductors': [0, 0, 0, 1], 'lightning': [1, 0, 3, 6], 'lightning strikes': [0, 0, 0, 1], 'electric field': [0, 0, 0, 1], 'building': [1, 0, 2, 6], 'charge': [1, 0, 4, 12], 'strike': [1, 0, 0, 0], 'earth': [0, 1, 1, 1]}

The correct answer is option 3, which states that statements 1, 3, and 4 are true about lightning conductors.

Statement 1 is true. Lightning conductors are designed to create an electric field at their top, which makes them more likely to be struck by lightning. This is because lightning is attracted to regions with higher electric fields.

Statement 3 is true. Lightning conductors are installed to provide a path of least resistance for the discharge of lightning. When a lightning strike occurs, the lightning conductor takes the charge (current) from the strike and directs it deep into the earth, away from the building. This helps to prevent damage to the building.

Statement 4 is true. Lightning conductors must be installed at a place taller than the building they are meant to protect. This is because they need to attract the lightning away from the building and provide a safe path for the discharge of the strike.

However, statement 2 is not true. Lightning conductors do not reduce the effect of the strike by uniformly distributing the charge (current) over the surface of the building. Their main purpose is to provide a safe path for the discharge of the lightning strike. Alert - correct answer should be option 1.