7 (a) Which of the following shows the electric field around a point charge?
(b) State one way of giving a rod a static electric charge - Edexcel - GCSE Physics - Question 7 - 2022 - Paper 1
Question 7
7 (a) Which of the following shows the electric field around a point charge?
(b) State one way of giving a rod a static electric charge.
(c) A cleaning company... show full transcript
Worked Solution & Example Answer:7 (a) Which of the following shows the electric field around a point charge?
(b) State one way of giving a rod a static electric charge - Edexcel - GCSE Physics - Question 7 - 2022 - Paper 1
Step 1
Which of the following shows the electric field around a point charge?
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Answer
The correct representation of the electric field around a point charge is option B, which illustrates the radial field lines radiating from the charge outward, indicating the direction of the electric field.
Step 2
State one way of giving a rod a static electric charge.
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Answer
One way of giving a rod a static electric charge is by friction. Rubbing the rod with a cloth can transfer electrons, thus charging the rod either negatively or positively.
Step 3
Explain the difference in the shape of the clouds of droplets in the disinfectant from two sprayers.
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Answer
The difference in shape arises because sprayer 1 charges the droplets negatively, causing them to repel each other and spread out more. In contrast, sprayer 2 does not impart any charge, leading to droplets that are attracted to each other and cluster more closely.
Step 4
Explain how charging the droplets in the cloud of disinfectant makes sure that every part of the seat is disinfected.
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Answer
Charging the droplets causes them to be attracted to the seat's surface. As they move towards the seat, the charged droplets ensure that even those not in the direct line of spray are pulled toward it. This induced charge distribution allows for an even coverage over the entire seat.
Step 5
Explain why the build-up of static electric charge would be dangerous.
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Answer
The build-up of static electric charge can create a spark that ignites flammable fuel vapors, leading to a serious fire hazard during refueling.
Step 6
Explain how the danger is reduced.
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Answer
To reduce the risk of static build-up, the pipe and the aeroplane are connected by a metal wire, which ensures that both are at the same electrical potential. This connection allows any static charge to dissipate safely. Additionally, using materials with low friction and ensuring proper grounding minimizes the chances of charge accumulation.
