A solenoid has a magnetic field at its center of 7.400 mT. If the solenoid has 471 turns and a current of 7.908 amps, its length, in centimeters, is, to three decimal places. Required:
a. What minimum number of turns per unit length must the solenoid have?
b. What total length of wire is required?

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