Question

A 60 $\mu F$ capacitor is charged to 100 volts.This charged capacitor is connected across a 1.5 mH coil, so that LC oscillations occur. The maximum current in the coil is:-

• A. 0.5 A
• B. 2 A
• C. 15 A
• D. 20 A

Answer 1

The correct option is A 0.5 A

$e=60\mu F=60\times {10}^{-6}F$

$V=100V$ $W=?$

$L=1.5mH$

$I=\frac{V}{R}=\frac{100}{\sqrt{{WL}^2+{\left(\frac{1}{We}\right)}^2}}$

$=\frac{100}{\sqrt{{(60\times {10}^{-6})}^2+{\left(\frac{1}{1.5\times {10}^{-3}}\right)}^2}}$

$I=0.5$