Which of the following statements must be true about a neutral atom?
O The atom must have an even number of protons.
The atom must have as many neutrons as protons.
The number of electrons and protons in the atom must be equal.
All of the atom's electrons and protons must be in the nucleus.

Students in an introductory physics lab are performing an experiment with a parallel-plate capacitor made of two circular aluminum plates, each 11 cm in diameter, separated by 1.0 cm. how much charge can be added to each of the plates before a spark jumps between the two plates? for such flat electrodes, assume that value of 3×106n/c of the field causes a spark.