RL串联电路R=30Ω,L=0.04H,外加电压u=10√2sin(1000t)V.则电路阻抗Z=(____)。
A30∠53.1°Ω$;$40∠53.1°Ω$;$50∠53.1°Ω$;$70∠53.1°Ω
B30∠53.1°Ω$;$40∠53.1°Ω$;$50∠53.1°Ω$;$70∠53.1°Ω
C30∠53.1°Ω$;$40∠53.1°Ω$;$50∠53.1°Ω$;$70∠53.1°Ω
D30∠53.1°Ω$;$40∠53.1°Ω$;$50∠53.1°Ω$;$70∠53.1°Ω