You apply f - 1-2-LC to find L- Which frequency will you select-

The correct option is D when V_R is maximumSince resonant frequency, f= 1 2π√( LC ) #160; #160;is being applied, current from the variable AC ...

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Byju's Answer

Standard XII

Physics

Frequency of Oscillations in LC Circuit

You apply f...

Question

You apply $f = \frac{1}{2 π \sqrt{L C}}$ to find L. Which frequency will you select?

when

V_{R}

is minimum

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when

V_{R}

is maximum

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when

V_{C}

is maximum

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when

V_{C}

is minimum

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Solution

The correct option is D when $V_{R}$ is maximum
Since resonant frequency, $f = \frac{1}{2 π \sqrt{L C}}$ is being applied, current from the variable AC source will be maximum when potential across resistor is maximum, because $V_{R} = i R$ and $R$ is fixed.
Thus when $V_{R}$ is maximum, we can measure the value of inductance without requiring an ammeter.

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