The current and emf through an inductance differ in phase by:

1. 

2. 

3. 

4. 

If the phase difference between the emf and the current in an AC circuit is $f$ then the RMS value of wattless current will be

In AC circuit a resistance of $R\Omega$ is connected in series with an inductance $L$. If the phase difference between the current and voltage is ${45}^o$, the inductive reactance will be

Assertion :An inductance and a resistance are connected in series with an AC circuit. In this circuit, the current and the potential difference across the resistance lags behind potential difference across the inductance by an angle $\frac{\pi }{2}$. Reason: In $L-R$ circuit, voltage leads the current by phase angle which depends on the value of inductance and resistance both.

A resistance of $10\Omega$ and a inductance of $100mH$ are connected in series through an alternating voltage source $V=100\cos \omega t$. Fond out phase difference between current and voltage for the circuit.

A coil has an inductance of 0.7 henry and is joined in series with a resistance of $220\Omega$ . When the alternating emf of 220 V at 50 Hz is applied to it then the phase through which current lags behind the applied emf and the wattless component of current in the circuit will be respectively 

If the phase difference between the emf and the current in an AC circuit is $f$ then the RMS value of wattless current will be

In AC circuit a resistance of $R\Omega$ is connected in series with an inductance $L$. If the phase difference between the current and voltage is ${45}^o$, the inductive reactance will be

Assertion :An inductance and a resistance are connected in series with an AC circuit. In this circuit, the current and the potential difference across the resistance lags behind potential difference across the inductance by an angle $\frac{\pi }{2}$. Reason: In $L-R$ circuit, voltage leads the current by phase angle which depends on the value of inductance and resistance both.