An electrostatic precipitator is used to remove dust particles from industrial flue gases. A spherical dust particle initially carries a net positive charge of +3.2 × 10-16 C. As it passes through a corona discharge region, it absorbs a stream of electrons, reaching a final net charge of -8.0 × 10-16 C. How many electrons did the dust particle absorb from the corona discharge?
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15 exam-style questions on OCR GCSE Physics Static and charge. Each one has a worked solution and a mark scheme showing where the marks go.