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2 marksElectric Fields

CSEC Physics · May/June 2007 · Paper 2 · Question 5(b)(ii)

When lightning strikes the earth, there is a massive flow of electrons from a thundercloud to the earth during a short time interval.

Describe a precaution which may be taken to protect a building against lightning.

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Other parts of this question

  1. 5(a)(i)Show, on the diagram above, the charge distribution on the paper.[2 marks]
  2. 5(a)(ii)Explain why there is a net force of attraction.[2 marks]
  3. 5(a)(iii)Draw, on Figure 5 above, the charge distribution on the paper when it is in contact with the polythene strip.[1 mark]
  4. 5(a)(iv)State whether the paper gains or loses charge and the type of charge transferred, when it touches the strip.[2 marks]
  5. 5(b)(i)Draw, on Figure 6 above, electric field lines between the cloud and the earth.[2 marks]
  6. 5(c)During a certain lightning strike, a current of 5 x 10⁴ A flows for a time period of 0.15 ms. Calculate the quantity of charge that flows from cloud to earth…[3 marks]

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