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Impedance in RLC Circuit

In the meter ...

Question

In the meter bridge circuit shown in figure, find the length AB for null deflection in galvanometer.

R=15Q R=10Q

A

80 cm

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B

40 cm

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C

20 cm

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D

60 cm

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Solution

The correct option is D 60 cm
$\frac{l}{100 - l} = \frac{3}{2}$

$2 l = 300 - 3 l$

$l = 60$

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