The resistance and inductance of an inductive coil are measured using an AC bridge as shown in the figure. The bridge is to be balanced by varying the impedance $Z_{2} .$

For obtaining balance, $Z_{2}$ should consists of element(s)

R and C

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R and L

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L and C

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Only C

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Solution

The correct option is B R and L
At balance,
$R_{1} \times Z_{2} = R_{3} [R_{4} + j ω L_{4}]$

$∴ Z_{2} = \frac{R_{3} R_{4}}{R_{1}} + \frac{j ω L_{4}}{R_{1}}$

$∴ Z_{2}$ should consist of R and L in series.

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