Consider an electric dipole with charge +qlocated at xd, and charge -q located at x+d. (a) compute the electric field e(0, y, 0) for points on the y-axis. justify the direction (sign) of your answer by sketching the field lines of the dipole. examine the limiting case where the dipole is very far away from our point of interest (i. e. y> > d) by writing your answer in terms of a simple formula times a power series in the small quantity d2/y2 (keeping terms through 2nd order).

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?

What part of the ear is names after tools, such as the hammer and the anvil?

Consider a file currently consisting of 200 blocks. assume that the file control block (and the index block in the case of indexed allocation) is already in memory. calculate how many disk i/o operations are required for contiguous, linked, and indexed (single-level) allocation strategies, for each of the conditions listed below. in the contiguous-allocation case, assume that there is not room to grow at the beginning but there is room to grow at the end. also assume that the block information to be added is stored in memory.