Turn over 7 9 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. V Q V0 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? A  ∆V × ∆Q B Δ Δ 2 V Q × C  V0 × ∆Q D 0 Δ 2 V Q × (Total for Question 9 = 1 mark) 10 Which of the following is a unit of magnetic flux? A N C−1 B T m−2 C V s D Wb m2 (Total for Question 10 = 1 mark)