14. A brick 20cm long, 10cm wide and 5cm thick has a mass of 500g. Determine the: (a) Least pressure that can be exerted by the brick on a flat surface. (3mks)​

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=