O-LevelPhysicsElectricity5054/21 · Oct/Nov 2014 · Q65 Marks
The base of a storm cloud is negatively charged. Fig. 6.1 shows the cloud above flat ground. [Figure 6.1]
- (a)The cloud causes the ground beneath it to become positively charged. Explain, in terms of the particles involved, how the ground becomes positively charged.[2]
- (b)In the space between the negative charge on the cloud and the positive charge on the ground, there is an electric field. State what is meant by an electric field.[1]
- (c)A lightning strike takes place. In 0.0015s, a charge of 180C passes between the cloud and the ground. Calculate the average current in the lightning strike.[2]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2014). The mark or mark type is shown in brackets.
- [2] (a) electrons repelled by cloud (leaving ground positive) not positive charge/protons move
- like charges repel or electrons negative
- [1] (b) (region) where (electric) charge experiences a force
- [2] (c) (I = ) Q/t or 180/0.0015
- 1.2 × 10⁵ A
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