What does the Hertzsprung-Russell diagram tell us about stars and their life cycles?

A. Stars enter the white dwarf stage once they have exhausted the hydrogen fuel in their cores and have
started to burn helium and other heavier elements

B. Every star goes through specific evolutionary stages dictated by its internal structure and how it produces
energy

C. Stars evolve, typically moving through the H-R diagram in the sequence white dwarf, main sequence, red
giant.

D. Red giants have low surface temperatures and high luminosities.

E. Stars spend about 90% of their lives burning hydrogen into helium in their cores as main sequence stars.

F. Our Sun would be classified as a red giant or letter B in the H-R diagram.

To understand the electric potential and electric field of a point charge in three dimensions consider a positive point charge q, located at the origin of three-dimensional space. throughout this problem, use k in place of 14? ? 0. part adue to symmetry, the electric field of a point charge at the origin must point from the origin.answer in one word.part bfind e(r), the magnitude of the electric field at distance r from the point charge q.express your answer in terms of r, k, and q. part cfind v(r), the electric potential at distance rfrom the point charge q.express your answer in terms of r, k, and q part dwhich of the following is the correct relationship between the magnitude of a radial electric field and its associated electric potential ? more than one answer may be correct for the particular case of a point charge at the origin, but you should choose the correct general relationship. a)e(r)=dv(r)drb)e(r)=v(r)rc)e(r)=? dv(r)drd)e(r)=? v(r)r