Physics 9702/32 — May/June 2017

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)

Assemble the circuit shown in Fig. 1.1.

Fig. 1.1

The two resistors are identical.
A, B and C are crocodile clips. Connect C to the screw.

(ii)

Connect A to the wire at a distance $p$ of approximately $25\text{ cm}$ from the screw, as shown in Fig. 1.2.

(iii)

Close the switch.

(iv)

Position B on the other side of the screw so that the two voltmeter readings have the same value $V$ .

The distance between the screw and B is $q$ , as shown in Fig. 1.2.

Fig. 1.2

(v)

Measure and record the distances $p$ and $q$ . Record $V$ .

$p$ = ______
$q$ = ______
$V$ = ______

(vi)

Open the switch.

(b)

Change $p$ and repeat (a)(iii), (a)(iv), (a)(v) and (a)(vi) until you have six sets of values of $p$ , $q$ and $V$ .
Record your results in a table.
Include values of $\frac{1}{p}$ and $\frac{1}{q}$ in your table.

10M

(c)

(i)

Plot a graph of $\frac{1}{q}$ on the $y$ -axis against $\frac{1}{p}$ 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 $q$ and $p$ are related by the equation

\frac{1}{q} = \frac{a}{p} + b

where $a$ and $b$ are constants.

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

$a$ = ______
$b$ = ______

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

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