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A sereis R-C circuit is connected to AC voltage source. Consider two cases, (A) when C is without a dielectric medium and (B) when C is filled with dielectric of constant 4. The current `I_(R)` through the resistor and voltage `V_(c)` across the capacitor are compared in the two cases. Which of the following is/ are true?A. `I_(R)^(A)gtI_(R)^(B)`B. `I_(R)^(A)ltI_(R)^(B)`C. `V_(A)^(C)gtV_(B)^(C)`D. `V_(A)^(C)gtV_(B)^(C)` |
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Answer» Correct Answer - A::C We know that `Z=sqrt(r^(2)+((1)/(WC))^(2))` The capacitance in case B is four times the capacitance in case A Impedance in case B is less then that of case A `(Z_(B)ltZ_(A))` Now `I=V/Z` `:. (I_(R)^(A))lt(I_(R)^(B))`. Option (a) is correct. `:. (V_(R)^(A))lt(V_(R)^(A))` `:. (V_(C)^(A))lt(V_(C)^(A))` if V is the applied potential potential difference access series R-C circuit then `V=sqrt((V_(R)^(2))+(V_(C)^(2)))`] (c) is the correct option . |
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