The alternating emf of `e=e_(0)` sin `omegat` is applied across LR series circuit. The impedance and phase angle between current and voltage is
A. `sqrt(R^(2)+X_(L)^(2)),"tan"^(-1)((X_(L))/(R))`
B. `sqrt(R^(2)-X_(L)^(2)),"tan"^(-1)((X_(L))/(R))`
C. `R+X_(L),tan^(-1)((R)/(X_(L)))`
D. `R-X_(L),tan^(-1)((R)/(X_(L)))`
