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The emf source, ɛ=4.5 V, of the circuit
shown in the figure has negligible internal
resistance. The resistors have resistances
R1=2 Q and R2=4.7 Q. The capacitor has a
capacitance C=4.9 µF.
Determine the time constant t, in units of
microseconds, for charging the capacitor.
What is the charge Q on the capacitor in
units of microcoulomb?

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