Rahul sits in a chair reading a book. which force is equal to the force rahul exerts on earth? rahul’s weight the chair’s weight the sum of the weights of rahul and the book the sum of the weights of the chair, rahul, and the book

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=