Question
Time period of a simple pendulum will be double, if we
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is fastest, then $Z$ is
$(A)$ the charge on the upper plate of $C _1$ is $2 CV _0$
$(B)$ the charge on the upper plate of $C _1$ is $CV _0$
$(C)$ the charge on the upper plate of $C _2$ is $0$
$(D)$ the charge on the upper plate of $C _2$ is $- CV _0$
Pick out which ones are for $AND, NAND$ and $NOT$ gates, respectively 
