DP Physics (first assessment 2025)

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Question 23M.2.SL.TZ2.i

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Date May 2023 Marks available [Maximum mark: 3] Reference code 23M.2.SL.TZ2.i
Level SL Paper 2 Time zone TZ2
Command term Show that Question number i Adapted from N/A
i.
[Maximum mark: 3]
23M.2.SL.TZ2.i

The resistor has a cross-sectional area of 9.6 × 10−6 m2.

Show that a resistor made from carbon fibre will be suitable for the pad.

[3]

Markscheme

ALTERNATIVE 1 (Calculation of length)
Read off from graph [2.8 − 3.2 × 10−5 Ω m]✓
Use of I=RAρ✓
l = 1.3 − 1.4 «m» ✓

ALTERNATIVE 2 (Calculation of area)
Read off from graph [2.8 − 3.2 × 10−5 Ω m]✓
Use of A=ρIR✓

A = 8.3 − 9.5 × 10−6 «m2» ✓

ALTERNATIVE 3 (Calculation of resistance)
Read off from graph [2.8 − 3.2 × 10−5 Ω m]✓
Use of R=ρIA✓

R = 3.6 − 4.2 «Ω» ✓

ALTERNATIVE 4 (Calculation of resistivity)
Use of ρ=RAI✓

ρ = 3.2 × 10−5 «Ω m» ✓

Read off from graph 260 – 280 K ✓

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