The coil has a radius of 5 cm and 50 turns. While moving the magnet closer towards the coil, at a certain point in time, the voltage meter shows 230 mV. What is the magnitude of the rate of change of the flux through the coil

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?