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Question 2 b) A storm cloud has -25 nC built up in a 1.0 km diameter spheri...

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Question 2 b)

storm cloud has -25 nC built up in a 1.0 km diameter spherical charge

centre located 10 km above the ground. This charge centre attracts a

similar amount of positive charge that is spread on the ground below the

ground.

The

charge centre and ground act as a charged capacitor, with a potential

difference of

V. In a lightning strike, the large

electric field between these two charged regions (acting as electrodes)

may ionise the air resulting in a conducting path between the cloud and

ground, through which the 'capacitor' discharges.

Image failed to load: A storm cloud with a spherical (negative) charge centre of 1km diameter sits 10 km above the ground which has positive signs.

Which of the curves shown below best approximates the shape of an equipotential drawn halfway between the charge centre and the ground?

Image failed to load: A curved dotted line, lower at the two sides, higher in the middle.

Image failed to load: A curved dotted line, higher at the sides, lower in the middle, somewhere between a circle and a horizontal straight line.

✅

Image failed to load: A wavy dotted line, similar to a sin curve.

Image failed to load: A straight dotted line.

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