In the figure given below, all phasors are with reference

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In the figure given below, all phasors are with reference to the potential at point “O”. The locus of voltage phasor V_YX as R is varied from zero to infinity is shown by

Correct Option: B

V_YX = V_X – V_Y
= V – 0 for R = ∞
= V – 2V for R = 0