Question 1(a)(i)
[Maximum number: 2]
This question is about electrostatics.
A student uses a plastic rod to investigate electrostatics.
Describe how the student could have charged the plastic rod.
IGCSE Physics 2.23P Charging by friction practical Topic Practice
2.23P Charging by friction practical
Practical: investigate how insulating materials can be charged by friction
Question 3
[Maximum number: 3]
A tumble dryer is a household device that dries clothes.
The clothes rotate in a heated cylinder.
Clothes often stick together when they are dry because they become electrostatically charged.
A student investigates how different materials charge electrostatically in a model tumble dryer.
The diagram shows the model tumble dryer.
This is the student's method.
- put four dry squares of the same material into the cylinder
- rotate the cylinder at constant speed for three minutes
- remove any squares that are stuck together
- measure the force needed to pull the squares apart
- repeat this for squares of different material
Question 3(a)(ii)
(a)
State the independent and dependent variables in this investigation.
independent
dependent
[ 2 ]
Question 3(a)(iii)
(b)
State a control variable in this investigation.
[ 1 ]
Question 4
[Maximum number: 5]
This question is about electrostatics.
Question 4(a)
(a)
A polythene rod is rubbed with a cloth, which causes both the rod and the cloth to become charged.
[ 1 ]
Question 4(a)(i)
(i)
Which of these is the force that causes the rod and the cloth to become charged?
A
friction
B
gravitational
C
magnetic
D
tension
[ 1 ]
Question 4(b)
(b)
A student has rods made from different materials.
The student rubs each rod the same way with a cloth.
The student measures the charge gained by each rod three times.
The table shows the results.
[ 4 ]
Question 4(b)(i)
(i)
One of the readings for the polythene rod is anomalous.
Circle the anomalous result in the results table.
[ 1 ]
Question 4(b)(ii)
(ii)
State how the student should deal with the anomalous result.
[ 1 ]
Question 4(b)(iii)
(iii)
Calculate the mean charge for the polythene rod.
mean charge = ............ nC
[ 2 ]
Question 5(d)
[Maximum number: 2]
A student uses this apparatus to investigate static electricity.
The positively charged ball is suspended vertically on a long length of string.
The student extends the investigation by measuring the reading on the scale for rods made from different materials.
As a control variable, the student charges each rod by rubbing it with a cloth the same number of times.
Give two other control variables for the student's investigation.
1 ............
2 ............