A resistor with resistance 10 MΩ is connected in series with a capacitor of capacitance 1.0μF and a battery with emf 12.0 V, Before the switch is closed at time t= 0 the capacitor is uncharged. a. What is the time constant? b. What fraction of the final charge is on the plates at time t = 20s? c). What fraction of the initial current remains at t = 20s ?
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