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Physics · May / June 2023 · Paper 62 · Question 4

0625

As printed in the paper

The question as text

A student investigates the change in current in a conducting liquid as the distance between two electrodes is changed. The circuit is shown in Fig. 4.1. A electrodes Fig. 4.1 Plan an experiment to investigate the change in current in the liquid as the distance between the electrodes is changed. You should: • explain briefly how to do the investigation • state the key variables to keep constant • draw a table, or tables, with column headings, to show how to display your readings (you are n required to enter any readings in the table) • explain how to use your readings to reach a conclusion.

Read automatically from the paper; the printed page above is exact.

Show the answer and mark scheme

MP1 method:

measure the distance between the electrodes

MP2 method:

measure / record / take / check / note the current or the ammeter reading

MP3 method:

repeat with at least four other distances

MP4 key variables:

potential difference / supply voltage / battery voltage / power supply

MP5 key variables:

any one from:

depth of immersion of electrodes
volume / amount of liquid
mass / size / material of the electrodes
room temperature
temperature / concentration of the liquid
type of liquid / electrolyte

MP6 table:

table with columns for distance and (change in) current with appropriate units

MP7 conclusion:

draw a graph of (change in) current against distance

OR

(use results table to) compare distances with currents

OR

(compare results to) see if changing the distance has any effect on the current

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