A battery establishes a voltageV on a parallel-plate capacitor. After the battery is disconnected, the capacitor doesn't loss charge however the distance between the plates is doubled and the area of the and the voltage between the plates plates is quadrupled. Accordingly, the capacitance A. increases; decreases.
B. decreases; increases.
C. increases; increases.
D. decreases; decreases
E. stays the same; stays the same.

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=