The sun is much closer to earth than are the nearest stars, yet it is not possible to measure accurately the diurnal parallax of the sun relative to the stars by measuring its position relative to background objects in the sky directly. explain why.

A10nc charge sits at a point in space where the magnitude of the electric field is 1500 n/c. what will the magnitude of the field be if the 10 nc charge is replaced by a 20 nc charge? assume the system is big enough to consider the charges as small test charges.