1.h A parallel plate capacitor has square plates of side 10 cm separated by 1mm.
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Question
1.h A parallel plate capacitor has square plates of side 10 cm separated by 1mm. Calculate its capacitance using c=e, od Express the answer in picofarads 2.hA 90 pF capacitor is connected to a 12 Volt battery and charged to 12 volts. How many electrons are transferred from one plate to the other? 3.hTwo capacitors have capacitances of 20 F and 30F Find the equivalent capacitance if the capacitors are connected a. In parallel b.h In series 4.hA 15F capacitor is charged to 60 Volts. How much energy is stored?Explanation / Answer
1) Here, C = Aeo/d = 0.10^2 ×8.85e-12/0.001
= 88.5*10^-12 F
= 88.5 pF
2) we know that, Q = CV = 90e-12*12
Number of electrons = Q/q = 90e-12*12/1.6e-19
= 6.75*10^9 electrons
3) i) C parallel = C1+C2 =20+30 = 50 uF
ii) C series = C1*C2/(C1+C2) = 20*30/(20+30)
= 600/50 = 12uF
4)energy U = 0.5CV^2 = 0.5*15e-6*60^2
= 0.027 J
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