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Electrostatic Potential And Capacitance

Question

A fully charged capacitor C with initial charge q₀ is connected to a coil of self inductance L at t = 0. The time at which the energy is stored equally between the electric and the magnetic fields is

$straight pi over 4 square root of LC$
$2 straight pi space square root of LC$
$square root of LC$
$straight pi square root of LC$

Solution

straight pi over 4 square root of LC

As initially, charge is maximum
∴ q = q_ocos ωt
Current,