DP Physics (last assessment 2024)

Question 19M.2.HL.TZ2.4bii

Date	May 2019	Marks available	[Maximum mark: 2]	Reference code	19M.2.HL.TZ2.4bii
Level	HL	Paper	2	Time zone	TZ2
Command term	Deduce	Question number	bii	Adapted from	N/A

bii.

[Maximum mark: 2]

19M.2.HL.TZ2.4bii

Three identical light bulbs, X, Y and Z, each of resistance 4.0 Ω are connected to a cell of emf 12 V. The cell has negligible internal resistance.

(bii)

The switch is now closed. ${\text{Deduce the ratio }}\frac{{{\text{power dissipated in Y with S open}}}}{{{\text{power dissipated in Y with S closed}}}}$ .

[2]

Markscheme

evidence in calculation or statement that pd across Y/current in Y is the same as before ✔

so ratio is 1 ✔

Examiners report

Very few gained any credit for this at both levels. Most performed complicated calculations involving the total circuit and using 12V – they had not realised that the question refers to Y only.

Syllabus sections

Core

Core » Topic 5: Electricity and magnetism » 5.3 – Electric cells

Core » Topic 5: Electricity and magnetism

Question 19M.2.HL.TZ2.4bii

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