Recognising Ohm's law on a graph
Each of the four graphs below has potential difference V on the vertical axis and current I on the horizontal axis. Ohm's law says \( V \propto I \), so the graph must be a straight line starting from the origin. A slopes downwards, B curves upwards, and D curves downwards. Only C is a straight line rising from the origin, so C shows Ohm's law.
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