Alternating Cur...

220 V, 50 Hz, AC source is connected to an inductance of 0.2 H and a resistance of 20 $$\Omega$$ in series. What is the current in the circuit?

In L-C-R circuit power of 3 mH inductance and $$4\Omega$$ resistance, EMF $$E=4\,cos\,1000t$$ volt is applied. The amplitude of current is

The impedance of a circuit, when a resistance $$R$$ and an inductor of inductance $$L$$ are connected in series in an AC circuit of frequency $$f$$, is

The current through a coil of self-inductance $$L=2mH$$ is given by $$i=t^2e^{-t}$$ at time t. How long it will take to make the emf zero?

In an LCR circuit inductance is changed from $$L$$ to $$\dfrac{L}{2}$$. To keep the same resonance frequency, $$C$$ should be changed to

The resonant frequency of an L-C circuit is

Resonance frequency of a circuit is $$f$$. If the capacitance is made $$4$$ times the initial value, then the resonance frequency will become

An oscillating circuit contains an inductor of inductance $$ { 10 }^{ -6 }$$ H and two capacitor each of capacitance $$5\times { 10 }^{ -6 }$$ farad connected in parallel. Then the resonance frequency of the circuit is

An alternating emf given by equation $$E = 300 sin [(100\pi )t]$$ $$volt$$ is applied to a resistance $$100\ ohms$$. The rms current through the circuit is (in $$amperes$$):

When $$100\ volt\ DC$$ is applied across a solenoid, a current of $$1.0\ amp$$ flows in it. When $$100\ volt\ AC$$ is applied across the same coil, the current drops to $$0.5\ amp.$$ If the frequency of the AC source is $$50\ Hz$$ the impedance and inductance of the solenoid are: