Physics (AS & A Level) · May / June 2016 · Paper 41 · Question 7
9702
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A student sets up the circuit shown in Fig. 7.1 to measure the charge on a capacitor C for different values of potential difference across the capacitor. V C meter to measure charge Fig. 7.1 The variation with potential difference V of the charge Q stored on the capacitor is shown in Fig. 7.2. 15 10 5 0 0 1 2 3 4 5 6 V / V Q / mC Fig. 7.2
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7(a)[2]
line has non-zero intercept/line does not pass through origin charge is/should be proportional to potential (difference) or charge is/should be zero when p.d. is zero (therefore there is a systematic error) [2]
7(b)[3]
reasonable attempt at line of best fit use of gradient of line of best fit clear C = 2800 µF (allow ± 200 µF) [3]
7(c)[3]
energy = ½ CV 2 or energy = ½ QV and C = Q / V ∆ energy = ½ × 2800 × 10–6 × (9.02 – 6.02) = 6.3 × 10–2 J [3]
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