The answer is C, but can you explain why? What do they mean by iron core inserte

Question

The answer is C, but can you explain why?

What do they mean by iron core inserted and how do I know if it was inserted or removed from the graph?

21. Your laboratory TA poses the following scenario to you for practice I wired a series RLC circuit and set the driving frequency to be the resonant frequency. Then I either inserted an iron core into the inductor or I removed an iron core from the inductor. After making that change, whichever it was. I measured three traces which are on the picture below. One is the curent in the circuit, one is the function generator's voltage, and one is the inductor's voltage. Which of the following statements are correct? A. Trace 1 is the fiunction generator's voltage, and the iron core was inserted. B. Trace 2 is the curent, and the iron core was inserted C. Trace 3 is the f D. Trace 1 is the inductor's voltage, and the iron core was inserted E. Trace 2 is the inductor's voltage, and the iron core was removed function generator's voltage, and the iron core was removed

Explanation / Answer

if the iron core was present, the peak value of function generator's voltage is dropped than the voltage across inductor ,but here in figure both the voltage is same,hence the Irn core is removed

since the RLC is in resonance,then initially the function geerator's voltage is at it's peak,So the trace is at peak initially ,So trace 3 represents,function generator's voltage

So the answer is C

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