A particle with charge +Q is placed outside a large neutral conducting sheet. At any point in the interior of the sheet, the electric field produced by charges on the surface is directed toward +Q. Explain why.?

Suppose that a comet that was seen in 563 a.d. by chinese astronomers was spotted again in year 1951. assume the time between observations is the period of the comet and take its eccentricity as 0.986. what are (a) the semimajor axis of the comet's orbit and (b) its greatest distance from the sun?

What is the role of lenses in microscopy?

Select the correct answer. what does the process of natural selection involve?