Physics 9702/31 — October/November 2023

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 electric circuit.

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

(a)

● Set up the circuit shown in Fig. 1.1.

Fig. 1.1

● F, G and H are crocodile clips.

The distance between nail N and G is $L$ , as shown in Fig. 1.1.

Adjust the position of G until $L$ is approximately $40\text{ cm}$ .

● Close the switch.

● Record $L$ and the ammeter readings $I_1$ and $I_2$ .

$L$ = ______
$I_1$ = ______
$I_2$ = ______

● Open the switch.

(b)

Change $L$ by adjusting the position of G between N and H. Measure and record $L$ , $I_1$ and $I_2$ . Repeat until you have six sets of values of $L$ , $I_1$ and $I_2$ .

Record your results in a table. Include values of $\frac{I_2}{(I_1 - I_2)}$ in your table.

(c)

(i)

Plot a graph of $\frac{I_2}{(I_1 - I_2)}$ on the $y$ -axis against $L$ 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 $L$ , $I_1$ and $I_2$ are related by the equation

\frac{I_2}{(I_1 - I_2)} = PL + Q

where $P$ and $Q$ are constants.

Using your answers in (c)(iii), determine the values of $P$ and $Q$ . Give appropriate units.

$P$ = ______
$Q$ = ______

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Q2Manipulation, Measurement and Observation · Presentation of Data and Observations · Analysis, Conclusions and Evaluation20M

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