10.2 For each of the following groups of sources, determineif the three sources constitute a balanced source, and if it is,determine if it has a positive or negative phase sequence.(a) va(t) = 169.7cos(377t +15◦) Vvb(t) = 169.7cos(377t −105◦) Vvc(t) = 169.7sin(377t −135◦) V(b) va(t) = 311cos(wt −12◦) Vvb(t) = 311cos(wt +108◦) Vvc(t) = 311cos(wt +228◦) V(c) V1 = 140 −140◦ VV2 = 114 −20◦ VV3 = 124 100◦ V

10.2 For each of the following groups of sources, determine
if the three sources constitute a balanced source, and if it is,
determine if it has a positive or negative phase sequence.
(a) va(t) = 169.7cos(377t +15◦) V
vb(t) = 169.7cos(377t −105◦) V
vc(t) = 169.7sin(377t −135◦) V
(b) va(t) = 311cos(wt −12◦) V
vb(t) = 311cos(wt +108◦) V
vc(t) = 311cos(wt +228◦) V
(c) V1 = 140 −140◦ V
V2 = 114 −20◦ V
V3 = 124 100◦ V