A transmission line is represented by the following per-unit voltage equation,
Vₛ = AVᵣ + BIᵣ
A=0.9789∠0.288∘pu and B=0.3043∠76.9∘pu.Assuming that Vᵣ is 1pu at full load, find the voltage regulation when the power factor of the load is unity.
(a) 21.78%
(b) −11.38%
(c) −21.78%
(d) 11.38%.