Physics 9702/35 — May/June 2019

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 two metre rules. One is labelled P and the other is labelled Q.

• Set up the circuit shown in Fig. 1.1.

Fig. 1.1

• F, G, H and J are crocodile clips.

Place H approximately half-way along the wire on rule P.

• The distance between F and H is $d$ , as shown in Fig. 1.1.

Record $d$ .

$d$ = ______

• Place J on the wire on rule Q so that the distance between G and J is approximately 60 cm. The distance between G and J is $c$ , as shown in Fig. 1.1.

• Record $c$ .

$c$ = ______

• Calculate $n$ , where $n = \frac{c - d}{d}$ .

$n$ = ______

(ii)

• Close the switch.

• Record the ammeter reading $I$ .

$I$ = ______

• Open the switch.

(b)

Keeping $d$ constant, vary $c$ until you have six sets of readings of $c$ and $I$ . Do not use values of $c$ less than $d$ .

Record your results in a table. Include values of $n$ and $\frac{(n + 2)}{(n + 1)}$ in your table.

(c)

(i)

Plot a graph of $I$ on the $y$ -axis against $\frac{(n + 2)}{(n + 1)}$ 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 $I$ and $n$ are related by the equation

I = S \frac{(n + 2)}{(n + 1)} + T

where $S$ and $T$ are constants.

Using your answers in (c)(iii), determine values for $S$ and $T$ . Give appropriate units.

$S$ = ______

$T$ = ______

(e)

Theory suggests that $S$ is inversely proportional to $d$ and that $T$ is independent of $d$ . The experiment is repeated using the same equipment but a larger value of $d$ .

For this experiment, draw a second line on the graph to show the expected results. Label this line W.

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