If we decrease frequency of applied A.C. with a purely capacitive load, do (1) amplitude of Vc and (

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7.Alternating Current

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If we decrease the frequency of the applied $A.C.$ with a purely capacitive load, do $(1)$ the amplitude of $V_c$ and $(2)$ amplitude of $I_c$ increase, decrease of remain the same.

A

$(1)$ increase $(2)$ same

B

$(1)$ same $(2)$ increase

C

$(1)$ same $(2)$ decrease

D

$(1)$ decrease $(2)$ same

(AIIMS-2011)

Solution

${X_c} = \frac{1}{{\omega _c\,}}$ and ${i_c} = \frac{{V_c}}{{X_c\,}}$

With decrease in frequency, $X_c$ increases and hence $i_c$ decreases.

Standard 12

Physics

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