You may not need to use all of the materials provided. In this experiment, you will investigate an electrical circuit. (a) Assemble the circuit as shown in Fig. 1.1. A and B are crocodile clips. PQ and RS are wires. Connect A near the midpoint of PQ. Measure and record the length $x$ of wire between P and A. $x$ = \_\_\_\_\_\_ $\text{cm}$ (b) Connect B to RS. Close the switch. Adjust the position of B until the voltmeter reading is as close as possible to zero. Measure and…

Physics 9702/32 — May/June 2019

Cambridge AS Level · Advanced Practical Skills · worked solutions for every part, with the mark scheme

questions

marks

120

minutes

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

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)

Assemble the circuit as shown in Fig. 1.1.

Fig. 1.1

A and B are crocodile clips. PQ and RS are wires.
Connect A near the midpoint of PQ.
Measure and record the length $x$ of wire between P and A.

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

(b)

Connect B to RS.
Close the switch.
Adjust the position of B until the voltmeter reading is as close as possible to zero.
Measure and record the length $y$ of wire between R and B.

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

Open the switch.

(c)

Change $x$ and repeat (b) until you have six sets of values of $x$ and $y$ .
Record your results in a table.
Include values of $\frac{1}{x}$ and $\frac{1}{y}$ in your table.

10M

(d)

(i)

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

It is suggested that the quantities $y$ and $x$ are related by the equation

\frac{1}{y} = \frac{a}{x} + b

where $a$ and $b$ are constants.

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

$a$ = ______
$b$ = ______

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