An infinite uniformly-charged sheet with a = -2 x 10^-10 C/m2 occupies the yz plane.
A deuteron1 is created at a point on the +x axis 5 m from the sheet. The deuteron is
produced with zero kinetic energy and is free to move.
a) What is the location of the deuteron at the instant its kinetic energy
is 5.428 x 10~18 J?
(b) Would the work required to move the deuteron back to its original
position be done by the system or an external agent? Justify your answer.