Please help! Spring calculations

In a good thermo flask the main cause of heat loss is

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground a. true or b. false