Cho mạch điện như hình vẽ tìm các dòng I1, I2 , I3 và I4 biết E1 = 120V, E2 = 60V, J = 10A, R1= R2= 20Ω. R3= R4= (10 + K) Ω
(k=5)

Two conductors, a and b, are each in the shape of a tetrahedron. but of different sizes. they are charged in the following manner: 1. tetrahedron a is charged from an electrostatic generator to charge q. 2. tetrahedron a is briefly touched to tetrahedron b. 3. steps 1 and 2 are repeated until the charge on tetrahedron b reaches a maximum value. if the charge on tetrahedron b was q/4 after the first time it touched tetrahedron a. what is the final charge qbmax on tetrahedron b?