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Two identical parallel plate capacitors are placed in series and connected to a constant voltage source of V volt. If one of the capacitors is completely immersed in a liquid with dielectric constant k, the potential difference between the plates of other capacitor will change to ?

Two identical parallel plate capacitors are placed in series and connected to a constant voltage source of V volt. If one of the capacitors is completely immersed in a liquid with dielectric constant k, the potential difference between the plates of other capacitor will change to ?

Grade:12

1 Answers

deepak
84 Points
4 years ago
if the capacitors are connected then before the introduction of the dielectric the voltage of each of them is V/2
by the formula for capacitance,
Q=CV
since the capacitors are connected in series therefore the charges on them must be a constant,
therefore C is inversely propotional to V    ….….1
on introduction of a dielectric liq. of constant k, the capacitance of immersed capacitor becomes kC
then  the voltage(potentiall difference between the plates)  on that capacitor wil become V/(1+k)     ….….by 1
then the voltage on the second capacitor will become V−V/(1+k)
 
hope this was useful
 

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