a condensor of capacity c discharged through an inductance l and resistance r in series and the charge q at time t satisfies the equation ldq^2 dt^2 +rdq dt. +q c=0.given that l=0.5, r=150, c=10^-6 farads andthat when t=0 and q=0.002 coulombs and current is 0. obtain the value of q in terms of t