Solved: Figure 25-39 represents two air-filled cylindrical

Chapter 25, Problem 24

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Figure 25-39 represents two air-filled cylindrical capacitors connected in series across a battery with potential V = 10 V. Capacitor 1 has an inner plate radius of 5.0 mm, an outer plate radius of 1.5 cm, and a length of 5.0 cm. Capacitor 2 has an inner plate radius of 2.5 mm, an outer plate radius of 1.0 cm, 1 ; .~J and a length of 9.0 cm. The outer plate of ca- .' .. ... '.1.,'.'. CI pacitor 2 is a conducting organic membrane V T that can be stretched, and the capacitor can _ ~'J:: C2 be inflated to increase the plate separation. I....-___ ..J If the outer plate radius is increased to 2.5 cm by inflation, (a) how many electrons move through point P and (b) do they move toward or away from the battery?