Work required to move an electron to a very far away postion

How much work is required to move an electron located 27.0 cm from a 54 nC charge to a very far away position?

my attempt:

I calculated the potential energy (Uo) at 27cm, which is -2.88*10^-16 J.
However I dont know what to do next

If anyone could tell me the next step that would be great

thanks

The next step is to remember that the potential energy of the system will be zero at infinite separation (assuming you're using the usual formula for potential energy, which defines the zero that way).

And the step after that is to remember that, assuming the speed of the electron is constant, the work done by an external force on the system (i.e., the answer) is the change in the system's potential energy.

You're welcome. I'm glad to help.

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