$4\mathrm{.}87$ The variable resistor $R_o$ in the circuit in Fig. P$4\mathrm{.}87$ is

PSPICE

adjusted until it absorbs maximum power from the MULTIIM circuit.

a$)$ Find the value of $R_o.$

b$)$ Find the maximum power.

c$)$ Find the percentage of the total power developed in the circuit that is delivered to $R_o.$

Figure P$4\mathrm{.}87$