When calibrating a set of scales, we obtain a measurement value for the mass of a standard weight that is 0.296 kg greater than the nominal mass. Thus we conclude that the error of the scales is 59.2%. How many kilogrammes was the mass of the weight used in the calibration?

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