these two examples, what exactly happens if the current goes from left to right? For the first example, when t = 0, where does the charge go? I know that after a long time, the capacitor will fill up and all the current goes through the resistor, but is it the same for t = 0?  For the second example, I know that at t=0, all the current goes through the wire, but after a while all the current will go through the resistor?

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Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.