[填空题]
A circuit contains a single 250-pF capacitor hook18sm+ue d0g hosa eqx3ml: 9g((s iw.he-j0irm cd8a3amu+ ku0 d across a battery. It is desired to store three times as much energy in a combination of two capacitors by adding a single capacitor to this onu83 m0+a0- idamjucrke.
How would you hook it up?
what would its value be? pF