The energy levels of a particle of mass m in a two-dimensional square box of side l are given by (n(1)^2 + n(2)^2)h^2/8ml^2. do any of these levels have the same energy? if so, find the values of the quantum numbers n(1) and n(2) for the first three cases. need explanation on how you came to the three numbers

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