For maximum power transfer between two cascaded sections of an electrical network, the relationship between the output impedance Z₁ of the first section to the input impedance Z₂ of the second section is

A source v_s(t) = V cos 100 $$\pi$$t has an internal impedance of (4 + j3) $$\Omega$$. If a purely resistive load connected to this source has to extract the maximum power out of the source, its value in $$\Omega$$ shoud be

In the circuit shown below, the Norton equivalent current in amperes with respect to terminals P and Q is

In the circuit shown below the value of R_L such that the power transferred to R_L is maximum