From the diagram above, if the potential differences across the resistor, capacitor, and inductor are 30V, 120V, and 60V, respectively, the effective potential difference is
Attached Figure / Diagram
A
81
B
67
C
59
D
73
Verified Correct Answer: B.
Physical Principles & Numerical Solution
\(V_L\)=60 V ,\(V_C\) = 120 V , \(V_R\) =30V
;V = ?
; \(V^2\) = \(V_R^2\) + \(V_L\) - \(V_C^2\)
= \(V^2\) = \(30^2\) + \(60 - 120^2\)
= \(V^2\) = 900 + 3600
= \(V^2\) = 4500
= V = \sqrt4500 = 67V
Source: WAEC / JAMB / NECO Classroom Archive (Record #68570)