AQA GCSE PHYSICS · PAPER 1 · FOUNDATION & HIGHER
Exam Practice: Static charge
Static charge · Electricity · Lesson 9 of 10 · 15 marks · 16 minutes
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Instructions
• Answer all the questions.
• Write your answers in the spaces provided.
• The marks for each question are shown in brackets - use this as a guide to how much to write.
• The answers are on separate pages at the back. Attempt every question before you look at them.
• Answer all questions. Use the mark allocation as a guide to how much to write.
Question 1 EXPLAIN (3 marks)
A polythene rod is rubbed with a cloth and becomes negatively charged. Explain how the rod becomes negatively charged.
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(Total for Question 1 = 3 marks)
Question 2 USE THE DIAGRAM (3 marks)
The diagram shows two charged balls hanging from threads. Ball A is negatively charged. (a) State the type of charge on ball B. (b) Name the type of force acting between the balls.
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(Total for Question 2 = 3 marks)
Question 3 EXPLAIN (3 marks)
A student walks across a nylon carpet and then gets a small electric shock when touching a metal door handle. Explain why.
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(Total for Question 3 = 3 marks)
Question 4 EXPLAIN (2 marks)
Explain why a charged balloon can stick to a wall even though the balloon and wall do not touch.
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(Total for Question 4 = 2 marks)
Question 5 EXPLAIN (4 marks)
Lightning is a very large spark. Explain how charge builds up in a cloud and what causes the lightning.
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(Total for Question 5 = 4 marks)
TOTAL FOR PAPER = 15 MARKS
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Answers and mark scheme
Check your answer only once you have written one.
Question 1 (3 marks)
Electrons are transferred from the cloth to the rod when they are rubbed together. The rod gains electrons so it becomes negative.
• Electrons transferred 1 mark
• From the cloth to the rod 1 mark
• Rod gains electrons so it is negative 1 mark
Question 2 (3 marks)
(a) Negative (they repel). (b) A non-contact force (electrostatic repulsion).
• Negative 1 mark
• Because they repel (like charges) 1 mark
• Non-contact force 1 mark
Question 3 (3 marks)
Electrons are rubbed off the carpet onto the student (or the other way round), so the student becomes charged. When the student touches the metal handle, charge flows through the metal to earth, causing a spark or shock.
• Rubbing transfers electrons 1 mark
• The student becomes charged 1 mark
• Charge flows to earth through the handle 1 mark
Question 4 (2 marks)
The charged balloon exerts a non-contact force (electrostatic force of attraction) on the wall.
• Non-contact force 1 mark
• Attraction between charged balloon and wall 1 mark
Question 5 (4 marks)
Collisions between ice particles in the cloud transfer electrons, so parts of the cloud become charged. A large potential difference forms between the cloud and the ground. The electric field becomes strong enough to ionise the air, which conducts, and charge flows as lightning.
• Electrons transferred by collisions or friction 1 mark
• Cloud charged, large pd between cloud and ground 1 mark
• Strong electric field ionises the air 1 mark
• Charge flows as a spark 1 mark