In this experiment, you will investigate an electrical circuit. You have been provided with a wooden strip with a wire attached. (a) Measure and record the length $L$ of the wire between the nails on the wooden strip, as shown in Fig. 1.1. $L$ = \_\_\_\_\_\_ (b) You have also been provided with a wire labelled A with crocodile clips at its ends. ● Set up the circuit shown in Fig. 1.2. ● F, G, H and J are crocodile clips. The distance between one of the nails and H is $d$, as…

Physics 9702/33 — May/June 2022

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

questions

marks

120

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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.

You have been provided with a wooden strip with a wire attached.

(a)

Measure and record the length $L$ of the wire between the nails on the wooden strip, as shown in Fig. 1.1.

Fig. 1.1

$L$ = ______

(b)

You have also been provided with a wire labelled A with crocodile clips at its ends.

● Set up the circuit shown in Fig. 1.2.

Fig. 1.2

● F, G, H and J are crocodile clips.

The distance between one of the nails and H is $d$ , as shown in Fig. 1.2. Attach H to the wire on the wooden strip so that $d$ is approximately $20\text{ cm}$ .

● Close the switch.

● Record the value of $d$ and the voltmeter readings $V_1$ and $V_2$ .

$d$ = ______
$V_1$ = ______
$V_2$ = ______

● Open the switch.

(c)

Increase $d$ by placing H at different positions on the wire and record $V_1$ and $V_2$ .
Repeat until you have six sets of readings of $d$ , $V_1$ and $V_2$ . Include your values from (b).

Record your results in a table. Include values of $(\frac{V_2}{V_1})d$ and $d^2$ in your table.

(d)

(i)

Plot a graph of $(\frac{V_2}{V_1})d$ on the $y$ -axis against $d^2$ 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 = ______

(e)

It is suggested that the quantities $V_1$ , $V_2$ and $d$ are related by the equation

\left(\frac{V_2}{V_1}\right)d = Pd^2 + Q

where $P$ and $Q$ are constants.

Using your answers in (d)(iii), determine values for $P$ and $Q$ .
Give appropriate units.

$P$ = ______
$Q$ = ______

(f)

Wire A has the same length $L$ as the wire between the nails.

Theory suggests that

P = -\frac{1}{L} \quad \text{and} \quad Q = L

A student repeats the experiment using two shorter wires of equal length.

Sketch a second line on the graph to show the expected results.
Label this line W.

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

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