There is a top view of a door of width l being closed by a force f pointed to the right. the door is currently opened at an angle of 60 degrees. the hinge of the door is marked. what is the torque about the hinge that is being applied to the door by force f? fl/2
fl
2fl
sqrt 3 fl/2
sqrt 2 fl/2

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=