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Question 19N.3.SL.TZ0.2a(i)

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.3.SL.TZ0.2a(i)
Level SL Paper 3 Time zone TZ0
Command term Estimate Question number a(i) Adapted from N/A
a(i).
[Maximum mark: 2]
19N.3.SL.TZ0.2a(i)

The resistance R of a wire of length L can be measured using the circuit shown.

In one experiment the wire has a uniform diameter of d = 0.500 mm. The graph shows data obtained for the variation of R with L.

The gradient of the line of best fit is 6.30 Ω m–1.

(a(i))

Estimate the resistivity of the material of the wire. Give your answer to an appropriate number of significant figures.

[2]

Markscheme

evidence of use of ρ = given gradient × wire area
OR
substitution of values from a single data point with wire area ✔

ρ=«=6.30×π×0.500×10-322=»1.24×10-6 «Ω  m»✔

NOTE: Check POT is correct.
MP2 must be correct to exactly 3 s.f.

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