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Edexcel | Physics WPH0 | S 10 6 1 | 1 hour 15 minutes

Boards | Edexcel | Physics WPH0

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1

A student is taking measurements from a piece of wire.

1

(a)

She measures the diameter d using a micrometer. She obtains the following readings

1

(a) (I)

1 Mark

Explain how you would use her readings to obtain the most accurate mean value

for the diameter of the wire

Ignore the anomalous 0.77

OR add the four good readings and divide by four

1

(a) (II)

1 Mark

Use her readings to obtain the most accurate mean value for the diameter of the

wire.

Wire diameter =

0.27 mm

1

(a) (III)

2 Mark s

Estimate the percentage uncertainty in your value for the diameter of the wire.

Percentage uncertainty =

Divides 0.015 or 0.02 or 0.03

by their mean value to calculate correct percentage

Example of calculation

0.02/0.27 = 7%

1

(b)

She then makes the following measurements.

length of wire = 663 mm

mass of wire = 0.32 g

1

(b) (I)

2 Mark s

Use her measurements to calculate the volume of the wire.

Volume =

1

(b) (II)

2 Mark s

Calculate the density of the material of the wire.

Density =

Use of mass/volume

Answer to 2 s.f. with unit for density consistent with

mass used

Example of calculation

1

(c)

2 Mark s

The tables below are taken from a data book

Use the information in the tables to identify the material of the wire and its standard

thickness.

Material of wire is

Standard thickness of wire is

Material is Nichrome

Thickness is 32 (swg)

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