Atemperature-stable resistor is made by connecting a resistor made of silicon in series with one made of iron. if the required total resistance is 1300 capital omega in a wide temperature range around 20degrees celsius, what should be the resistances of the two resistors? the temperature coefficients of the resistivities for iron and silicon are: alphairon = 5.0times 10-3 k-1 alphasilicon = -75times 10-3 k-1 resistance of the silicon resistor at 20degrees celsius:

An  atom  (ours, not carroll's) consists of a positively charged  nucleus, surrounded by one or more negatively charged particles called  electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6  nm.  *  if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -