Exam code: 8463
Which of the following substances can become statically charged?
Tick (ā) twoĀ boxes.Ā Ā
Copper | |
Air | |
PlasticĀ | |
Gold | |
SteelĀ |
Which of the following are examples of static electricity?
Tick (ā) twoĀ boxes.Ā Ā
Hair sticking up after taking off a hat | |
Electrons flowing through an electrical circuit | |
Photocopiers sticking power to a document | |
High-speed electrons emitted during nuclear decay |
Was this exam question helpful?
Which of the following pairs of charges shows the correct force acting between them?
Tick (ā) one box.Ā
 |  |  |  |
A student rubs a plastic rod with a cloth. Both are uncharged initially. The cloth becomes positively charged.
Which row best describes the charge on the rod when compared to the cloth?
Tick (ā) one box.Ā Ā
Positive and larger | |
Positive and equal | |
Positive and lesser | |
Negative and larger | |
Negative and equal | |
Negative and lesser |
Was this exam question helpful?
Figure 1 shows a student rubbing a plastic rod with a cloth.Ā
Figure 1
Describe a method to show that the plastic rod has now gained charge.
Complete the sentences.Ā
Choose answers from the box.Ā
Each answer can be used once, more than once or not at all.
electrons | protons | neutrons |
positive | neutral | negative |
When a plastic rod is rubbed with a cloth, the plastic rod gains ..............................Ā
After the plastic rod has been rubbed with the cloth, the plastic rod has a .............................. charge.
And the cloth has a .............................. charge.
Was this exam question helpful?
Figure 1 shows a Van de Graaff generator that is used to make pupilsā hair stand on end the world over.
Figure 1
Explain how an object with no charge may become positively charged.
On the diagram below, draw the electric field pattern around the Van de Graaff generatorās dome.
A negatively charged object is placed at each of the positions shown below: A, B, C, and D.
Identify the point at which the object would experience the greatest force.
Position ________
Was this exam question helpful?
Figure 2 shows a student touching the dome of a charged Van de Graaff generator.
Figure 2
Explain why the studentās hair stands on end when the generator is switched on.
When the potential difference between the dome and the student reached 20 kV, a spark jumped to the student from the dome.
This spark transferred 50 mJ of energy by heating, light and sound.
Calculate the charge carried by the spark.
The spark transfers the charge to the student in a time of 1.5 ms.
Calculate the current in the spark.
Was this exam question helpful?
Figure 3 shows a youth jumping on a trampoline while wearing socks.
Figure 3
As the youth bounces, friction between his socks and the trampoline cause him to become negatively charged.
Explain why friction causes the youth to become charged.
The youthās head is shown as a circle in the diagram below.
The studentās head is negatively charged.
Draw the electric field pattern around the youthās head.
When the youth stops jumping and touches the metal side of the trampoline, he receives an electric shock.
Explain why.
The youth got fed up with constantly receiving shocks and decided to wear a grounded wrist strap when bouncing.
This severely hampered his ability to perform acrobatic manoeuvres but did prevent the shocks.
A grounded wrist strap contains a thin copper wire which connects the youthās wrist to the trampoline frame.
Suggest why the grounded wrist strap prevents shock.
Was this exam question helpful?
A childrenās playground slide is made from plastic.
As a child slides down the slide, she becomes electrostatically charged.
Explain why.
When the child gets to the bottom of the slide, her hair is standing on end.
What conclusion can be made about the electrical charge on the childās head from this observation?
Justify your answer.
How would the charge on the child be different if the slide were made from metal?
Was this exam question helpful?
A student rubs a glass rod with a piece of polystyrene.
The glass rod becomes positively charged.
Explain how this happens.
The student placed the glass rod onto a balance, as shown in Figure 5 below.
A piece of insulating material was placed between the glass rod and the balance.
Figure 5
The student then rubbed a pvc rod with a pair of nylon tights and held it near to, but not touching the glass rod on the balance.Ā
The reading on the balance decreased.
Figure 6
Explain why the reading on the balance decreases.
When the student brings the two rods closer together, the reading on the balance decreases still further.
What can the student conclude from this observation?
Was this exam question helpful?