Along solenoid has 103 turns/cm and carries current i. an electron moves within the solenoid in a circle of radius 2.60 cm perpendicular to the solenoid axis. the speed of the electron is 1.38 × 107 m/s. find the current i in the solenoid.

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?