If a voltage is put over the circuit, the capacitor is charged and current passes through the resistor. The value is the time constant. The emf…

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If a voltage is put over the circuit, the capacitor is charged and current passes through the resistor. The value is the time constant. The emf source is switched on at t=0. A) After how much time is the capacitor C charged to 75% of its full capacity? B) what is the maximum current through the system?