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1 1 Student A investigated how the current in resistor R at constant temperature varied with the potential difference across the resistor. Student A recorded

1 1 Student A investigated how the current in resistor R at constant temperature varied with the potential difference across the resistor. Student A recorded both positive and negative values of current. Figure 14 shows the circuit Student A used. Figure 14 + A R 1 1 . 1 Describe a method that Student A could use for this investigation. [6 marks]

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