An electrostatic dust precipitator that is installed in a factory smokestack includes a straight metal wire of length l 0.8 m that is charged approximately uniformly with a total charge 0 0.4x 10-7 c. a speck of coal dust (which is mostly carbon) is near the wire, far from both ends of the wire; the distance from the wire to the speck is d 1.5 cm. carbon has an atomic mass of 12 (6 protons and 6 neutrons in the nucleus). a careful measurement of the polarizability of a carbon atom gives the value c-m n/c î±= 1.96 ã 10-40 (a) calculate the initial acceleration of the speck of coal dust, neglecting gravity. explain your steps clearly. your answer must be expressed in terms of q, l, d and you can use other quantities in your calculations, but your final result must not include them. don't put nun ers into your ca eu n in e very end but then show the numerical calculation that you carry out on your calculator. it is convenient to use the "binomial expansion" that you may have learned in calculus, that ( l + e)" 1 + neä¯s ñ ã i. note that n can be negative. (b) if the speck of coal dust were initially twice as far from the charged wire, how much smaller would be the initial acceleration of the speck?