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Date November 2017 Marks available 2 Reference code 17N.3.SL.TZ0.2
Level Standard level Paper Paper 3 Time zone 0 - no time zone
Command term Show that Question number 2 Adapted from N/A

Question

An electrical circuit is used during an experiment to measure the current I in a variable resistor of resistance R. The emf of the cell is e and the cell has an internal resistance r.

A graph shows the variation of 1 I with R.

Show that the gradient of the graph is equal to 1 e .

[2]
a.

State the value of the intercept on the R axis.

[1]
b.

Markscheme

«ε = IR + Ir»

1 I = R ε + r ε

identifies equation with y = mx + c

«hence m 1 ε »

No mark for stating data booklet equation

Do not accept working where r is ignored or ε = IR is used

OWTTE

a.

«–» r

Allow answer in words

b.

Examiners report

[N/A]
a.
[N/A]
b.

Syllabus sections

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