A+30.0 nc charge is placed at the origin of an xy-coordinate system, and a −25.0 nc charge is placed at the point (3.000 m, −0.0450 m).
(a) determine the magnitude and the direction of the force that the positive charge exerts on the negative charge. use ijk notation for your result.
f =
(b) determine the magnitude and direction of the force of the negative charge on the positive charge.
f=

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