Physics 9702/35 — October/November 2010

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 determine the resistivity of a metal in the form of a wire.

(a)

(i)

Measure and record the diameter $d$ of the short sample of wire that is attached to the card. You may remove the wire from the card.

$d$ = ______

(ii)

Calculate the cross-sectional area $A$ of the wire using the formula

A = \frac{\pi d^2}{4}

$A$ = ______

(b)

(i)

Set up the circuit shown in Fig. 1.1 and close the switch.

Fig. 1.1

(ii)

Position the crocodile clip labelled ‘Y’ half-way along the wire.

(iii)

Measure and record the distance $x$ of wire between the two crocodile clips, and the ammeter reading $I$ .

$x$ = ______
$I$ = ______

(c)

Change $x$ and repeat (b)(iii) until you have six sets of readings of $x$ and $I$ .

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

(d)

(i)

Plot a graph of $\frac{1}{I}$ on the $y$ -axis against $x$ 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 = ______

(e)

The quantities $I$ and $x$ are related by the equation

\frac{1}{I} = Mx + N

where $M$ and $N$ are constants and

\frac{M}{N} = \frac{\rho}{AR}

where $\rho$ is the resistivity of the material of the wire and the resistance $R$ of the fixed resistor is given on a card.

Use your answers in (a)(ii) and (d)(iii) to determine a value for $\rho$ .

$\rho$ = ______

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

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