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Chapter 23: Problem 21
A capacitor's plates hold \(1.3 \mu \mathrm{C}\) when charged to \(60 \mathrm{V}\). What's its capacitance?
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Two positive point charges are infinitely far apart. Is it possible, using a finite amount of work, to move them until they're a small distance \(d\) apart?
A camera requires \(5.0 \mathrm{J}\) of energy for a flash lasting \(1.0 \mathrm{ms}\). (a) What power does the flashtube use while it's flashing? (b) If the flashtube operates at \(200 \mathrm{V},\) what size capacitor is needed to supply the flash energy? (c) If the flashtube is fired once every \(10 \mathrm{s},\) what's its average power consumption?
A medical defibrillator stores \(950 \mathrm{J}\) in a \(100-\mu \mathrm{F}\) capacitor. (a) What is the voltage across the capacitor? (b) If the capacitor discharges 300 J of its stored energy in 2.5 ms, what's the power delivered during this time?
A capacitor is said to carry a charge \(Q .\) What's the net charge on the entire capacitor?
An unknown capacitor \(C\) is connected in series with a \(3.0-\mu \mathrm{F}\) capacitor; this pair is placed in parallel with a 1.0 - \(\mu\) F capacitor, and the entire combination is put in series with a 2.0 - \(\mu\) F capacitor. (a) Make a circuit diagram of this network. (b) When a potential difference of \(100 \mathrm{V}\) is applied across the open ends of the network, the total energy stored in all the capacitors is \(5.8 \mathrm{mJ}\). Find \(C\).
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