An ac source is connected in the given circuit. The value of $\mathrm{\varphi }$ will be :

$\mathrm{V}=220\sin (100\mathrm{\pi t}+\mathrm{\varphi })\text{ volt }$
In a LR circuit, phase difference between current and voltage, is given by tan L$\tan \mathrm{\varphi }=\frac{\mathrm{L\omega }}{\mathrm{R}}$ 
$\tan \mathrm{\varphi }=\frac{1}{\mathrm{\pi }}\frac{100\mathrm{\pi }}{100}=1$
$\mathrm{\varphi }={45}^{\circ }$ voltage is leading the current.