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Question 18N.2.HL.TZ0.7c

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Date November 2018 Marks available [Maximum mark: 3] Reference code 18N.2.HL.TZ0.7c
Level HL Paper 2 Time zone TZ0
Command term Comment Question number c Adapted from N/A
c.
[Maximum mark: 3]
18N.2.HL.TZ0.7c

A small electric motor is used with a 12 mF capacitor and a battery in a school experiment.

When the switch is connected to X, the capacitor is charged using the battery. When the switch is connected to Y, the capacitor fully discharges through the electric motor that raises a small mass.

(c)

An additional identical capacitor is connected in series with the first capacitor and the charging and discharging processes are repeated. Comment on the effect this change has on the height and time taken to raise the 45 g mass.

[3]

Markscheme

C halved ✔

so energy stored is halved/reduced so rises «less than» half height ✔

discharge time/raise time less as RC halved/reduced ✔

 

Allow 6 mF

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