Calculate the energy for vacancy formation in nickel (Ni), given that the equilibrium number of vacancies at 850C (1123 K) is 4.7 1022 m3 . The atomic weight and density (at 850C) for Ni are, respectively, 58.69 g/mol and 8.80 g/cm3 .

t.                 w               e                 n                   t                 y                 c             h               a           r           a               c                 t             e             r             s        

gans

explanation:

vestigial organs (like your appendix) are organs that no longer serve a purpose.

there are no contact forces mentioned on the list of choices that you've provided.

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.