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Question 17N.2.SL.TZ0.a.i

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Date November 2017 Marks available [Maximum mark: 1] Reference code 17N.2.SL.TZ0.a.i
Level SL Paper 2 Time zone TZ0
Command term Calculate Question number a.i Adapted from N/A
a.i.
[Maximum mark: 1]
17N.2.SL.TZ0.a.i

Electrical resistors can be made by forming a thin film of carbon on a layer of an insulating material.

A carbon film resistor is made from a film of width 8.0 mm and of thickness 2.0 μm. The diagram shows the direction of charge flow through the resistor.

The resistance of the carbon film is 82 Ω. The resistivity of carbon is 4.1 x 10–5 Ω m. Calculate the length l of the film.

[1]

Markscheme

«l = R A ρ = 82 × 8 × 10 − 3 × 2 × 10 − 6 4.1 × 10 − 5 »

0.032 «m»

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