A second candle emits a wave of amplitude 2A. At what distance from this candle would you need to stand to measure an intensity I

What is the difference between electrically neutral objects and electrically charged objects

If the area of a square has increased by a factor of 16, by how much has each side increased?

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.