1. The problem statement, all variables and given/known data An isolated parallel-plate capacitor (not connected to a battery) has a charge of Q=1.4x10^-5 C. The separation between the plates initially is d=1.2 mm, and for this separation the capacitance is 3.1x10^-11 F. Calculate the work that must be don to pull the plates apart until their separation becomes 4.5 mm if the charge on the plates remains constant. The capacitor plates are in a vacuum. 2. Relevant equations u=(1/2)E^2(epsilon,zero) W=U2-U1 U=(1/2)(Q^2)/C 3. The attempt at a solution CAN I HAVE SOME HELP?