交流电路阻抗Z=3+j4 Ω,电流I=10A,则电路无功功率Q=(____)。
A400W$;$400VA$;$400var$;$500var
B400W$;$400VA$;$400var$;$500var
C400W$;$400VA$;$400var$;$500var
D400W$;$400VA$;$400var$;$500var
A400W$;$400VA$;$400var$;$500var
B400W$;$400VA$;$400var$;$500var
C400W$;$400VA$;$400var$;$500var
D400W$;$400VA$;$400var$;$500var