Physics 9702/32 — May/June 2022

Cambridge AS Level · Advanced Practical Skills · worked solutions for every part, with the mark scheme

questions

marks

120

minutes

Topics Manipulation, Measurement and Observation · Presentation of Data and Observations · Analysis, Conclusions and Evaluation

Q1Manipulation, Measurement and ObservationPresentation of Data and ObservationsAnalysis, Conclusions and EvaluationFree sample

In this experiment, you will investigate an electrical circuit.

(a)

(i)

You have been provided with a stand with two clamps attached.
Do not change the positions of the clamps during the experiment.

Measure the distance $x$ between the centres of the rods of the two clamps, as shown in Fig. 1.1.

Fig. 1.1

$x$ = ______ $\text{cm}$

(ii)

You have been provided with a length of resistance wire with crocodile clips attached to its ends.

● Wrap the wire around the rods of the clamps, as shown in Fig. 1.2.

Fig. 1.2

● Connect the ohmmeter to the crocodile clips, as shown in Fig. 1.2.
● Record the resistance $R$ shown by the ohmmeter.

$R$ = ______

(b)

● Five sections of wire are in contact with both rods, as shown in Fig. 1.3.

Fig. 1.3

● Record the number $n$ of sections of wire that are in contact with both rods.

$n$ = ______

Change $n$ by wrapping the wire around the rods a different number of times. Measure $R$ and count $n$ . Continue until you have five sets of values of $R$ and $n$ .

Record your results in a table. Include values of $(n - \frac{1}{n})$ to three significant figures in your table.

10M

(c)

(i)

Plot a graph of $R$ on the $y$ -axis against $(n - \frac{1}{n})$ on the $x$ -axis.

(ii)

Draw the straight line of best fit.

(iii)

Determine the gradient and $y$ -intercept of this line.

gradient = ______
$y$ -intercept = ______

(d)

It is suggested that the quantities $R$ and $n$ are related by the equation

R = a(n - \frac{1}{n}) + b

where $a$ and $b$ are constants.

Use your answers in (c)(iii) to determine the values of $a$ and $b$ . Give appropriate units.

$a$ = ______
$b$ = ______

(e)

The resistance per unit length $r$ of the wire can be found using

a = -xr

Calculate $r$ . Give an appropriate unit.

$r$ = ______

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Q2Manipulation, Measurement and Observation · Analysis, Conclusions and Evaluation · Presentation of Data and Observations20M

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