WAEC Physics 2024 Objective — Question 22

Question 22 of 50 from the West African Examinations Council (WAEC) Physics 2024 Objective paper, with the correct answer and a full explanation.

22. (Use the circuit diagram to answer this question: a constant voltage source supplies a sinusoidal alternating e.m.f. The voltage marked against the components are their peak values: L=6V, R=3V, C=2V.) Determine the peak value of the applied e.m.f.

A. 1 VB.
B. 4 V.
C. 5 VD.
D. 1 VCorrect

Explanation

In an RLC circuit, effective voltage V=sqrt(VR^2+(VL-VC)^2) = sqrt(3^2+(6-2)^2) = sqrt(9+16) = sqrt(25) = 5V.

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