An MRI (magnetic resonance imaging) machine uses intense magnetic fields to produce detailed images of the interior of the body. The patient is placed inside a solenoid made of superconducting wires that can carry very high currents. If the solenoid is 48.1 cm in diameter and 105.7 cm long and produces a uniform 5.45 T magnetic field, how much magnetic energy is stored in the solenoid? (in J)

An electron is trapped at a defect in a crystal. the defect may be modeled as a one-dimensional, rigid-walled box of width 1.00 nm. (a) sketch the wavefunctions and probability densities for the n 1 and n 2 states. (b) for the n 1 state, nd the probability of nding the electron between x1 0.15 nm and x2 0.35 nm, where x 0 is the left side of the box. (c) repeat (b) for the n 2 state. (d) calculate the energies in electron volts of the n 1 and n 2 states