lf the internal energy of the system decrease, then what can be conclude about the heat and the work done? A, Heat is added to the system and work is done by the system B, Heat is removed from the system and work is done by the system C, Heat is removed from the system and work is done on the system D, Heat is added to the system and work is done on the system​

Four point charges each having charge q are located at the corners of a square having sides of length a. find symbolic expressions for the following. (a) the total electric potential at the center of the square due to the four charges (use any variable or symbol stated above along with the following as necessary: ke.) vtotal= (b) the work required to bring a fifth charge p from infinity to the center of the square (use any variable or symbol stated above along with the following as necessary: w=