The resistivity of copper is 1.77×10-11 Ωm. A copper wire of length 56.5 cm and cross-sectional area 1×10-6m2 is connected to the two sides of a 9 V battery. If no other resistance is connected to the battery, what will be the current flowing in the wire? 9.0×105 A

1.0×105 A

2.9×105 A

1.1×105 A

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 -