Question

Question #18ca7

Answer 1

Same potential across each in parallel so:

`Q = CV implies Q_1/5 = Q_2/7 = implies Q_1 = 5/7 Q_2`

In addition we have conservation of charge.

Total charge before they are joined, `Q_i` was:

`sum Qi = (5 * 450 + 7 * 750)/(10^(6)) =3/400 C`

`Q_i = Q_1 + Q_2`

`implies Q_2 = 7/1600 C, Q_1 = 1/320 C`

Voltage:

`V = Q_2/C_2 = (7/1600)/(7 * 10^(-6)) = 625 V`