Question

An electronic flash unit for a camera is activated when a capacitor is discharged through a filament of wire. After the flash is triggered and the capacitor is discharged, the circuit (see the figure) is connected and the battery pack generates a current to recharge the capacitor. The time it takes for the capacitor to recharge is called the recycle time. For a particular flash unit using a 12 -volt battery pack, the charge $q,$ in coulombs, on the capacitor $t$ seconds after recharging has started is given by $$q=0.0009\left(1-e^{-0.2 t}\right)$$ How many seconds will it take the capacitor to reach a charge of 0.0007 coulomb? Compute the answer to three significant digits. CAN'T COPY THE FIGURE

          An electronic flash unit for a camera is activated when a capacitor is discharged through a filament of wire. After the flash is triggered and the capacitor is discharged, the circuit (see the figure) is connected and the battery pack generates a current to recharge the capacitor. The time it takes for the capacitor to recharge is called the recycle time. For a particular flash unit using a 12 -volt battery pack, the charge $q,$ in coulombs, on the capacitor $t$ seconds after recharging has started is given by
$$q=0.0009\left(1-e^{-0.2 t}\right)$$
How many seconds will it take the capacitor to reach a charge of 0.0007 coulomb? Compute the answer to three significant digits.
CAN'T COPY THE FIGURE

Added by Anthony M.

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