Please solve completely and explain every step. Thank you.
QUESTION B2
(a) Compute the values of three branch currents I1 and I2 for the circuit below. What is the voltage drop between points A and B?
A: 0.74
B: 712
25A: 0.55
0.25s: 0.2S
6A: B0
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(b) Three concentric spheres of radii 4, 6, and 8 cm have charges of +8, +6, and +4 pC respectively. What are the potentials and field strengths at points 2, 5, 7, and 10 cm from the center?
It should be remembered that the field intensity outside a sphere is the same as that obtained by considering the charge at its center. Inside the sphere, the field strength is zero. The potential anywhere inside a sphere is the same as at its surface.