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Question 1
This question is about static electricity. A student rubs a plastic rod with a cloth and it becomes negatively charged. |
a) | Explain why the friction between the rod and cloth causes the rod to become negatively charged.
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b) | When the charged rod is placed near a thin stream of water, it causes the stream of water to deflect. Explain why.
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c) | The student accidentally puts the rod in the stream of water. Explain why the stream of water does not deflect as far as before.
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Question 2
This question is about static electricity. |
a) | A student rubs the balloon on their jumper for 1 minute. The balloon gains a negative charge. Explain why rubbing the balloon on the student's jumper gives it a negative charge.
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b) | The student charges a second balloon in the same way. Both balloons are suspended from threads and brought close together. Explain what the student would observe.
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c) | One of the charged balloons is now placed carefully on a vertical wall. Explain why the balloon does not fall to the ground.
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Question 3
This question is about the hazards of static electricity in the aviation industry. |
a) | As aircraft fly through the air, they become statically charged. Explain how an aircraft could become charged during flight.
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b) | Describe why it is dangerous to refuel a statically charged aircraft.
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c) | Before aircraft are refuelled, they are connected to Earth by an electrical cable. Explain why this makes refuelling safe.
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d) | As an aircraft flies, it gains roughly 72 mC of charge. The charge of 1 electron is 1.6x10-19 C. Calculate how many electrons were transferred during this flight.
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Question 4
A plastic comb becomes negatively charged when rubbed with a cloth. The charged comb is brought close to small pieces of paper. |
a) | Explain why the pieces of paper jump up and stick to the comb.
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b) | The student rubs a metal rod with a cloth and brings it close to the pieces of paper. Explain what happens to the pieces of paper.
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Question 5
A teacher is demonstrating the idea of static electricity using a Van de Graaff generator. |
a) | Explain how the metal dome of the Van de Graaff becomes positively charged.
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b) | Before the teacher turned on the Van de Graaff generator, he placed a pile of metal cake cases on top. The cake cases also became positively charged. Explain the cake cases need to be made from metal.
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c) | The teacher turns on the Van de Graaff generator. Explain why the metal cake cases begin to fly off after a short period.
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Question 6
A student places two metal plates a short distance apart. A large potential difference is applied across the plates. An insulated ball covered in metallic paint is suspended from a light thread and suspended between the plates. |
a) | When the ball touches the negatively charged metal plate it becomes charged. Explain why.
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b) | The ball now swings rapidly across towards the positively charged plate. Explain why.
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c) | The frequency of the shuttling ball between the plates is 4.0 Hz. Explain what is meant by a frequency of 4.0 Hz.
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d) | The charge transferred between the plates per second is 5 x 10-9 C. The charge on an individual electron is 1.6 x 10-19 C. Calculate the number of electrons transferred between the plates.
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Question 7
This question is about electrostatic paint spraying. The nozzle of the paint gun is negatively charged and the car being painted it positively charged. |
a) | Explain why the paint forms a fine mist as it leaves the spray gun.
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b) | Explain why is the car positively charged.
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c) | As the paint leaves the spray gun it gains a negative charge because A it gains negatively charged electrons B it gains negatively charged protons C it loses negatively charged electrons D it loses negatively charged protons
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Question 8
This question is about static electricity. |
a) | Complete the sentence. When a rod is rubbed with a cloth it gains a negative charge because A protons are transferred to the rod B protons are transferred from the rod C electrons are transferred to the rod D electrons are transferred from the rod
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b) | What is the unit for charge? A volt (V) B ampere (A) C coulomb (C) D ohm (Ω)
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c) | Which of these is a property of a metal? A good conductor of electricity B good insulator of electricity C negatively charged material D source of static electricity
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Question 9
A child is playing on a slide at the park. After going down the slide, the child's hair is standing on end. |
a) | As the child goes down the slide they become negatively charged. Explain why the child becomes charged.
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b) | Explain why the child's hair is standing on end.
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c) | The child gets off the slide and touches the metal frame of the slide. Explain what happens to the child's hair.
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| 7 | 8 | 9 |