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

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