DP Physics (first assessment 2025)

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Question 22M.1A.SL.TZ1.21

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.1A.SL.TZ1.21
Level SL Paper 1A Time zone TZ1
Command term Question number 21 Adapted from N/A
21.
[Maximum mark: 1]
22M.1A.SL.TZ1.21

Three identical resistors each of resistance R are connected with a variable resistor X as shown. X is initially set to R. The current in the cell is 0.60 A.

The cell has negligible internal resistance.

X is now set to zero. What is the current in the cell?

A.  0.45 A

B.  0.60 A

C.  0.90 A

D.  1.80 A

[1]

Markscheme

C

Examiners report

Option C was the most common (correct) answer, however option B was also a frequent response. This question had a relatively high discrimination index, suggesting that more able candidates had less difficulty managing resistance in this combination circuit.

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