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From the diagram above if the potential differe... - JAMB Physics 2009 Question

From the diagram above, if the potential difference across the resistor, capacitor and inductor are 80 v, 110 v, 40 v respectively, the effective potential difference is
A
116.3 V
B
50.0 V
C
230.0 V
D
106.3 V
correct option: d
V =
√ (v1 + v2)2 + VR2 



V =
√ (40 + 110)2 + 802 


V =
√ (-70)2 + 802 

=
√ 4900 + 6400 

=
√ 11300 

= 106.3v
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