Physics 9702/34 — October/November 2021

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

● A, B, C and D are crocodile clips.

Connect A approximately half-way along wire 1.

● Measure and record the distance $p$ between B and A, as shown in Fig. 1.1.

$p$ = ______ $\text{cm}$

● Close the switch.

● Test your circuit by placing C at end E of wire 2. The voltmeter reading should be non-zero. Record the voltmeter reading.

voltmeter reading = ______ $\text{V}$

● Open the switch.

(ii)

● Close the switch.

● Adjust the position of C on wire 2 until the voltmeter reading is as close as possible to zero.

● The distance between C and E is $q$ , as shown in Fig. 1.1.

Measure and record $q$ .

$q$ = ______ $\text{cm}$

● Open the switch.

(b)

Move A to a new position on wire 1. Measure and record $p$ and repeat (a)(ii). Repeat until you have six sets of values for $p$ and $q$ .

Record your results in a table. Include values of $\frac{1}{q}$ and $\frac{p}{q}$ in your table.

10M

(c)

(i)

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

\frac{1}{q} = a \left( \frac{p}{q} \right) + 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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