As light from a star spreads out and weakens do gaps form between the photons?

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane

Coal contains energy. a. light b. kinetic c. chemical d. mechanical

Point charges q1=+2.00μc and q2=−2.00μc are placed at adjacent corners of a square for which the length of each side is 1.50 cm . point a is at the center of the square, and point b is at the empty corner closest to q2. take the electric potential to be zero at a distance far from both charges. part a what is the electric potential at point a due to q1 and q2? express your answer with the appropriate units.