An alternating current generator has an internal resistance $R_{g}$ and an internal reactance $X_{g}$. It is used to supply power to a passive load consisting of a resistance $R_{g}$ and a reactance $X_{L}$. For maximum power to be delivered from the generator to the load, the value of $X_{L}$ is equal to
(a) zero.
(b) $X_{g}$.
(c) $-X_{g}$.
(d) $R_{g}$.
An alternating current generator has an internal resistance $R_{g}$ and an internal reactance $X_{g}$. It is used to supply power to a passive load consisting of a resistance $R_{g}$ and a reactance $X_{L}$. For maximum power to be delivered from the generator to the load, the value of $X_{L}$ is equal to
(a) zero.
(b) $X_{g}$.
(c) $-X_{g}$.
(d) $R_{g}$.

(c) $-X_{g}$.