two positive point charges q and 4q are at x = 0 and x = l, respectively, and free to move. a third charge is placed along the x axis so that the entire three-charge system is in static equilibrium. what are the magnitude, sign, and x-coordinate of the third charge? [ -49 at x= l/3 1

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

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

Does current flow through or across a resistor?