question_answer

A resistor R and \[2\mu F\] capacitor in series is connected through a switch to 200 V direct supply. Across the capacitor is a neon bulb that lights up at 120 V. Find the value of R to make the bulb light up 5 s after the switch has been closed. \[\left( {{\log }_{10}}2.5=0.4 \right)\]

A)  \[1.3\times {{10}^{4}}\Omega \]         

B)  \[1.7\times {{10}^{5}}\Omega \]

C)  \[2.7\times {{10}^{6}}\Omega \]

D)  \[3.3\times {{10}^{7}}\Omega \]