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Question 18M.2.HL.TZ1.4c.i

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.2.HL.TZ1.4c.i
Level HL Paper 2 Time zone TZ1
Command term Determine Question number c.i Adapted from N/A
c.i.
[Maximum mark: 2]
18M.2.HL.TZ1.4c.i

An ohmic conductor is connected to an ideal ammeter and to a power supply of output voltage V.

M18/4/PHYSI/SP2/ENG/TZ1/04

The following data are available for the conductor:

                    density of free electrons     = 8.5 × 1022 cm−3

                    resistivity                          ρ = 1.7 × 10−8 Ωm

                    dimensions           w × h × l = 0.020 cm × 0.020 cm × 10 cm.

 

The ammeter reading is 2.0 A.

The electric field E inside the sample can be approximated as the uniform electric field between two parallel plates.

(c.i)

Determine the electric field strength E.

[2]

Markscheme

V = RI = 0.086 «V»

« V d = 0.086 0.10 = » 0.86 «V m–1»

 

Allow ECF from 4(a).

Allow ECF from MP1.

[2 marks]

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