The graph shows how the current I I\,I in a branch of a simple detector circuit varies with time ttt.
What is the total charge that flows through this branch of the circuit during the 30 ms interval?
1.2×10−4 C1.2 \times 10^{-4}\text{ C}1.2×10−4 C
1.9×10−4 C1.9 \times 10^{-4}\text{ C}1.9×10−4 C
2.4×10−4 C2.4 \times 10^{-4}\text{ C}2.4×10−4 C
2.9×10−4 C2.9 \times 10^{-4}\text{ C}2.9×10−4 C