Alternating Cur...

In the circuit shown how soon will the coil current reach $$\eta$$ fraction of the steady - state value 

The reactance of a coil when used in the domestic AC power supply (220 V 50 cycles) is 100 Ohm. The self inductance of the coil is nearly 

The correct phase diagram representing the relation between I$$_L$$ , I$$_C$$ and E in an anti-resonant LC circuit is:

An ideal inductor takes a current of 10 A when connected to a $$  125 {V}, 50 {Hz}  $$ ac supply.A pure resistor across the same source takes 12.5 A.If the two are connected in series across a $$  100 {V}, 40 {Hz}  $$ -supply,the current through the circuit will be

Equivalent inductance of the circuit shown in the figure is

Impedance of LR circuit is-

In an electric circuit applied ac emf is  $$e = 20 \sin 300 \ t$$  volt and the current is  $$i = 4 \sin 300 \ t$$  ampere.The reactance of the circuit is

Impedance of a coil having inductance $$0.4H$$ at frequency of $$50Hz$$ will be

Above the resonant frequency,

The resonance frequency changes if .is a change in L-C-R series A.C. circuit.