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Question 22M.2.HL.TZ2.4c.i

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Date May 2022 Marks available [Maximum mark: 3] Reference code 22M.2.HL.TZ2.4c.i
Level HL Paper 2 Time zone TZ2
Command term Calculate Question number c.i Adapted from N/A
c.i.
[Maximum mark: 3]
22M.2.HL.TZ2.4c.i

A cell is connected to an ideal voltmeter, a switch S and a resistor R. The resistance of R is 4.0 Ω.

When S is open the reading on the voltmeter is 12 V. When S is closed the voltmeter reads 8.0 V.

The voltmeter is used in another circuit that contains two secondary cells.

Cell A has an emf of 10 V and an internal resistance of 1.0 Ω. Cell B has an emf of 4.0 V and an internal resistance of 2.0 Ω.

(c.i)

Calculate the reading on the voltmeter.

[3]

Markscheme

Loop equation showing EITHER correct voltages, i.e., 10 – 4 on one side or both emf’s positive on different sides of the equation OR correct resistances, i.e. I (1 + 2) ✓

10−4 = I (1 + 2) OR I = 2.0 «A» seen ✓

V = 8.0 «V» ✓

 

Allow any valid method

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