1.

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. Calculate the value of R to make the bulb light up 5 s after the switch has been closed. \[(lo{{g}_{10}}2.5=0.4)\]

A. \[1.3\times {{10}^{4}}\Omega \]                      
B. \[1.7\times {{10}^{5}}\Omega \]
C. \[2.7\times {{10}^{6}}\Omega \]          
D. \[3.3\times {{10}^{7}}\Omega \]
Answer» D. \[3.3\times {{10}^{7}}\Omega \]


Discussion

No Comment Found

Related MCQs