In a gas discharge tube, doubly charged positive helium ions (He2+\text{He}^{2+}He2+) flow to the left at a rate of 3.0 × 1016 ions per second, while electrons flow to the right at a rate of 5.0 × 1016 electrons per second.
What is the magnitude of the net charge that passes through a cross-section of the tube in 2.5 minutes2.5\text{ minutes}2.5 minutes?
(The elementary charge e=1.60×10−19 Ce = 1.60 \times 10^{-19}\text{ C}e=1.60×10−19 C)
0.24 C0.24\text{ C}0.24 C
1.92 C1.92\text{ C}1.92 C
2.64 C2.64\text{ C}2.64 C
0.48 C0.48\text{ C}0.48 C
31 exam-style questions on Edexcel IGCSE Physics Electric charge. Each one has a worked solution and a mark scheme showing where the marks go.