What is the ratio of inductive reactance to capacitive reactance in an $AC$ circuit?

What is the dimension of impedance?

In an $A.C.$ circuit,the reactance of a coil is $\sqrt{3}$ times its resistance. The phase difference between the voltage across the coil and the current through the coil will be

The phase difference between current and voltage in an $AC$ circuit is $\pi/4$ radian. If the frequency of $AC$ is $50\, Hz$,then the phase difference is equivalent to the time difference:

The unit of reactance is

Define inductive reactance and capacitive reactance for an $L-C-R$ series $AC$ circuit. Write their formulas and $SI$ units.