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3 marksElectric Fields

CAPE Physics Unit 2 · 2018 · Paper 2 · Question 4(a)(iii)

Describe the functional properties of lightning rods and explain how they work to protect structures on the ground.

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  1. 4(a)(i)Describe the conditions in the atmosphere which lead to a lightning strike and state the electrical property of the strike that makes it dangerous to natural…[2 marks]
  2. 4(a)(ii)Define the term 'breakdown' and state ONE condition under which breakdown is likely to occur.[2 marks]
  3. 4(b)On Figure 5, sketch the forces F₆ and F₁₈ on the third charge of +10 μC due to the +6 μC and the -18 μC charges respectively.[2 marks]
  4. 4(c)Calculate the magnitude of EACH of the forces, F₆ and F₁₈.[3 marks]
  5. 4(d)Determine a value for the NET vertical force on the +10 μC charge.[3 marks]

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