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How much voltage (in terms of the power source voltage Vb ) will the capacitor have...

How much voltage (in terms of the power source voltage Vb ) will the capacitor have when it has started at zero volts potential difference, it is connected to the power supply and resistor and one characteristic time has passed (i.e. t = pi )?

How much voltage (in terms of the initial charge on the capacitor) will the capacitor have when it is connected to a resistor and one characteristic time has passed (i.e. t = pi )?

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