Out of the following graphs,which graph shows the correct relation (graphical representation) for an $LC$ parallel resonant circuit?

In a series $L-C-R$ circuit,the capacitance is changed from $C$ to $2C$. To obtain the same resonance frequency,the inductance should be changed from $L$ to:

In an $LCR$ series circuit, at resonance,

Power delivered by the $ac$ source of the circuit becomes maximum when

In which of the following $AC$ circuit, we get the value of power factor $1$ at resonance condition?

The inductance $L$,capacitance $C$,and resistance $R$ are the values of the components connected in series to an $AC$ source of angular frequency $\omega$. The inductive and capacitive reactances are $X_L$ and $X_C$ respectively. If the circuit is purely resistive,then