The whistle on a train produces a sound wave with a particular pitch. which of the following best describes the whistle sound that a person perceives while the train approaches him or her? a. a higher pitch, then a lower pitch b. the same pitch c. a higher pitch d. a lower pitch

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.