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An AC source of variable frequency f is ...

An `AC` source of variable frequency `f` is connected to an `LCR` series circuit. Which one of the graphs in figure represents the variation of current of current `I` in the circuit with frequecy `f`?

A

B

C

D

Text Solution

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The correct Answer is:
D
(a) By inserting soft iron we have changed self-inductance of coil but steady - state current remains the same as voltage divided by resistance of bulb and hence steady - state brightness of bulb is not affected .
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MODERN PUBLICATION-ALTERNATING CURRENT -COMPETITION FILE (OBJECTIVE TYPE QUESTIONS) A. (MUTIPLE CHOICE QUESTIONS)
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  14. At resonance, the value of the power factor in an LCR series circuit i...

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