Physics 9702/35 — October/November 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

You may not need to use all of the materials provided.

In this experiment, you will investigate an electrical circuit.

(a)

(i)

Set up the circuit shown in Fig. 1.1.

Fig. 1.1

(ii)

Close the switch.

(iii)

Record the voltmeter reading $V$ .

$V$ = ______

(iv)

Open the switch.

(v)

Calculate $\frac{V}{2}$ .

$\frac{V}{2}$ = ______

(b)

(i)

Set up the circuit shown in Fig. 1.2, using a resistor of resistance $R$ equal to $10\ \Omega$ .

Fig. 1.2

(ii)

Close the switch.

(iii)

Move crocodile clip C along the wire until the voltmeter reading is equal to your value for $\frac{V}{2}$ in (a)(v).

(iv)

Measure and record the distances $p$ and $q$ as shown in Fig. 1.2.

$p$ = ______
$q$ = ______

(v)

Open the switch.

(c)

Using one resistor at a time, vary $R$ and repeat (b)(ii), (b)(iii), (b)(iv) and (b)(v) until you have six sets of readings of $p$ , $q$ and $R$ . You may include your results from (b).

Record your results in a table. Include values of $\frac{q}{R}$ and $\frac{q}{p}$ in your table.

10M

(d)

(i)

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

\frac{q}{p} = \frac{aq}{R} + b

where $a$ and $b$ are constants.

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

$a$ = ______
$b$ = ______

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