Practice Problem on Adding Capacitors
              C1=7 micro-F  C2=3 micro-F
          +--------||----------||----------------------+
          |                                            |
    ------+           C3=2 micro-F                     +------
          |      +--------||--------+                  |
          |      |                  |    C5=4 micro-F  |
          +------+                  +--------||--------+
                 |    C4=2 micro-F  |
                 +--------||--------+
If the voltage across C5 is 2 V, what is the charge on C4? Give your answer to two decimal places.

ANSWER = 4.00 micro-C