Physics 9702/33 — May/June 2018

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

Q12MManipulation, Measurement and ObservationPresentation of Data and ObservationsAnalysis, Conclusions and EvaluationFree sample

In this experiment, you will investigate an electrical circuit.

(a)

• Set up the circuit shown in Fig. 1.1.

Fig. 1.1

F and G are crocodile clips.

• Place G on the wire so that the distance $x$ between the ends of F and G is approximately $40\text{ cm}$ .

• Measure and record $x$ .

$x$ = ______

• Close the switch.

• Record the voltages $V_1$ and $V_2$ .

$V_1$ = ______
$V_2$ = ______

• Open the switch.

(b)

Vary $x$ until you have six sets of readings of $x$ , $V_1$ and $V_2$ .

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

10M

(c)

(i)

Plot a graph of $(V_2 - V_1)$ on the $y$ -axis against $\frac{V_1}{x}$ 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 $V_2$ , $V_1$ and $x$ are related by the equation

(V_2 - V_1) = \frac{PV_1}{x} + Q

where $P$ and $Q$ are constants.

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

$P$ = ______
$Q$ = ______

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