1.

In an oscillating LC circuit with L = 50mH and C = 4.0 mu F, the current is initially a maximum.How long will it take before the capaciotr is fully discharged for the first time:

Answer»

`7 xx 10^(-4)s`
`14 xx 10^(-4)s`
`28 xx 10^(-4)s`
none

Solution :Time PERIOD, `T = 2pi sqrt(LC)` = `2pi sqrt((50 xx 10^(-3)) xx 4 xx 10^(-6))`
` = 28 xx 10^(-4) s`
Time taken by capacitor to charge FULLY,
`t = (T)/(4) = 7 xx 10^(-4)s`.


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