Physics 9702/35 — October/November 2015

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 how the potential difference across a resistor changes as the resistance of the circuit is changed.

(a)

(i)

Set up the circuit shown in Fig. 1.1.

Fig. 1.1

The two crocodile clips attached to the wires on the wooden strips should be approximately half-way along each of the wires.

(ii)

Measure and record the lengths $a$ and $b$ .

$a$ = ______
$b$ = ______

(iii)

Calculate the value of $C$ where $C = a + b$ .

$C$ = ______

(iv)

Close the switch.

(v)

Record the voltmeter reading $V$ .

$V$ = ______

(vi)

Open the switch.

(b)

(i)

Change the value of $a$ . Measure and record this value of $a$ .

$a$ = ______

(ii)

Calculate the new value of $b$ using $b = C - a$ .

$b$ = ______

(iii)

Change $b$ to the value shown in (b)(ii).

(iv)

Close the switch.

(v)

Record the voltmeter reading $V$ .

$V$ = ______

(vi)

Open the switch.

(c)

Repeat (b) until you have six sets of readings of $a$ , $b$ and $V$ .

Include values of $\frac{1}{V}$ in your table.

10M

(d)

(i)

Plot a graph of $\frac{1}{V}$ on the $y$ -axis against $b$ 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)

The quantities $V$ and $b$ are related by the equation

\frac{1}{V} = Pb + Q

where $P$ and $Q$ are constants.

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

$P$ = ______
$Q$ = ______

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

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