The principal astronomical alignment at Stonehenge, as well as the most common astronomical alignment at archaeoastronomical sites worldwide: A. Summer solstice sunrise. B. Summer solstice sunset. C. Winter solstice sunrise. D. Winter solstice sunset. E. Equinox sunrise. F. Equinox sunset. G. Maximum northernmost moonrise. H. Maximum northernmost moonset. I. Maximum southernmost moonrise. J. Maximum southernmost moonset. K. Minimum northernmost moonrise. L. Minimum northernmost moonset. M. Minimum southernmost moonrise. N. Minimum southernmost moonset.

To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the conductor. a conductor is placed in an external electrostatic field. the external field is uniform before the conductor is placed within it. the conductor is completely isolated from any source of current or charge. part a: which of the following describes the electric field inside this conductor? it is in the same direction as the original external field. it is in the opposite direction from that of the original external field. it has a direction determined entirely by the charge on its surface. it is always zero. part b: the charge density inside the conductor is: 0non-zero; but uniformnon-zero; non-uniforminfinite part c: assume that at some point just outside the surface of the conductor, the electric field has magnitude e and is directed toward the surface of the conductor. what is the charge density η on the surface of the conductor at that point? express your answer in terms of e and ϵ0