When an electric current passes through a coil of wire instead of a single straight piece of wire, what is the result?
A. A stronger magnetic field
B. A weaker electric field
C. A weaker magnetic field
D. A stronger electric field

Materials will have different energies associated with the electrons inside them. this is related to how strongly bound they are by their work function. if we sandwich a material with a very low energy between two materials with a high energy, we create a trap for an electron. if this trap is very narrow in one direction in comparison to the others, this is approximately a 1-dimensional box that confines the electron. what is the lowest energy of an electron in the box if the thinnest direction across the materials is 4.81 nm?