nce 2RIrom the centerr 26. SA rod of length L (Fig. P20.26) lies along the x axis with its left end at the origin. It has a nonuniform charge density A = ax, where a is a positive constant. (a) What B d are the units of a? (b) Calcu- A late the electric potential at A. - 27. S For the arrangement de- scribed in Problem 26, calcu- Figure P20.26 Problems 26 late the electric potential at point B, which lies on the per- pendicular bisector of the rod a distance b above the xaxis. and 27. do

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.