DP Physics (first assessment 2025)

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Question 22N.2.SL.TZ0.5b.ii

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Date November 2022 Marks available [Maximum mark: 2] Reference code 22N.2.SL.TZ0.5b.ii
Level SL Paper 2 Time zone TZ0
Command term Show that Question number b.ii Adapted from N/A
b.ii.
[Maximum mark: 2]
22N.2.SL.TZ0.5b.ii
(b.ii)

Show that the internal resistance of the cell is about 0.7 Ω.

[2]

Markscheme

29.4 (50.0 + r) = 139 (10.0 + r) ✓


attempt to solve for r, e.g. 29.4 × 50.0 − 139 × 10.0 = r (139 − 29.4)

OR

0.73 «Ω» ✓

 

Do not allow working backwards from 0.7 Ω.

Examiners report

Many answers here produced a number that did not round to 0.7 but students claimed it did. The simultaneous equation approach was seen in the best candidates, getting the right answer. It is worthy of reminding about the need of showing one more decimal place when calculating a show that value type of question.

Syllabus sections