In the meter bridge shown in figure, the length \( A B \) for null ...

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In the meter bridge shown in figure, the length \( A B \) for null deflection in galvanometer is
(1) \( 40 \mathrm{~cm} \)
(2) \( 20 \mathrm{~cm} \)
(3) \( 80 \mathrm{~cm} \)
(4) \( 60 \mathrm{~cm} \)
\( \mathrm{P} \)
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