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Question 18M.2.HL.TZ2.b.i

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.2.HL.TZ2.b.i
Level HL Paper 2 Time zone TZ2
Command term Calculate Question number b.i Adapted from N/A
b.i.
[Maximum mark: 2]
18M.2.HL.TZ2.b.i

A negatively charged thundercloud above the Earth’s surface may be modelled by a parallel plate capacitor.

M18/4/PHYSI/HP2/ENG/TZ2/08

The lower plate of the capacitor is the Earth’s surface and the upper plate is the base of the thundercloud.

The following data are available.

Area of thundercloud base = 1.2 × 10 8   m 2 Charge on thundercloud base = − 25  C Distance of thundercloud base from Earth's surface = 1600  m Permittivity of air = 8.8 × 10 − 12  F  m − 1

Calculate in V, the potential difference between the thundercloud and the Earth’s surface.

[2]

Markscheme

V = « Q C =»  25 6.6 × 10 − 7

V = 3.8 × 107 «V»

 

Award [2] for a bald correct answer

[2 marks]

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