El eje de un cilindro metálico hueco largo (radio interior = 1,0 cm, radio exterior = 2,0 cm) coincide con un cable largo. el alambre tiene una densidad de carga lineal de -8.0 pC / m, y el cilindro tiene una capa neta por unidad de longitud de -4.0 pC / m. Determine la magnitud del campo eléctrico 3.0 cm a partir del eje. a. 5.4 N/C
b. 7.2 N/C
c. 4.3 N/C
d. 3.6 N/C
e. 2.4 N/C

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 -

Yuauhahahanqqnnqhahajna

The rocks expand when there hot/warm  and contract when they are cold.