Electrical Energy and Capacitance63The potential difference between the two shells is therefore, 11eeerarbbaVVVkQabbbab==−∆=−=− −− = The capacitance of this device is given by ()eQabCVkba∆−(b) When b, then . Thus, in the limit as , the capacitance found above becomes a>>bab−≈b→∞04Caπ=eeak→=∈abkb16.59The energy stored in a charged capacitor is 212V=∆WC. Hence, 3-62300J24.4710 V4.47 kV30.010 FWVC==×=×16.60From ( )QC, the capacitance of the capacitor with air between the plates is
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