I can\'t get right on b A 8.0-MuF parallel-plate capacitor is connected to a 15.

Question

I can't get right on b A 8.0-MuF parallel-plate capacitor is connected to a 15.0-V battery. After the capacitor is fully charged, the battery is disconnected without loss of any of the charge on the plates. (a) A voltmeter is connected across the two plates without discharging them. What does it read? 15.0 V (b) What would the voltmeter read if the plate separation were doubled? 7.5 V What would the voltmeter read if the radius of each plate were tripled and, but their separation was unchanged? 1.67 V

Explanation / Answer

b. if V is doubled, V = 2*15 = 30 V

as V = Ed

if d doubles, V also doublkes    30 V

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