A capacitor is connected to a power supply and charged to a potential difference V0.
The graph shows how the potential difference V across the capacitor varies with the charge Q on the capacitor.
At a potential difference V0 a small charge ∆Q is added to the capacitor. This results in a small increase in potential difference ∆V across the capacitor.
Which of the following gives the approximate increase in energy stored on the capacitor due to this extra charge?
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