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The required answer involves physical principles without detailed
mathematics. For example ... Explain the principle of resonance
in an LC series circuit in physical terms.
"When the capacitor is fully charged energy is stored
in the electric field between the plates and the current is zero.
No energy is stored in the magnetic field of the inductance.
As the capacitor discharges the current increases. When the capacitor
is fully discharged the energy in the electric field is zero
and the energy stored in the magnetic field is a maximum since
the current is then a maximum. Resonance occurs as energy is
repeatedly exchanged between the electric and magnetic fields.
The resonant frequency is determined by the values of capacitance
C and inductance L."
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