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Take care not to confuse the quantity or variable $V$ (voltage) with the unit $\mathrm{V}$ (volt). Voltage is measured in volts ($\mathrm{V}$). Energy is measured in joules ($\mathrm{J}$) or electronvolts ($\mathrm{eV}$). Charge is measured in coloumbs ($\mathrm{C}$). One volt is equal to one joule per coulomb. Here's how you do it: We know \$q = -e = -1.6 \...

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When outer surface is not connected to earth surface then on inner surface of outer cylinder -q is induced and on outer +q on outer surface.When we connect outer cylinder to earth then +q on outer surface flows down to earth(but earth does not get charged as earth is charge sink) so that whole system potential energy decreases.If -q from inner surface of ...

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Be careful with the wording of the question. It doesn't ask for the potential difference between the cylinders (although you'll have to calculate that to get the final answer). It asks for the "potential of the inner cylinder". You can only give the potential of an object if you know what the reference potential is, and can determine the potential ...

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