For what value of the length \( l \), the deflection in the galvano...

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For what value of the length \( l \), the deflection in the galvanometer will be zero in the following potentiometer arrangement? The length of the wire \( \mathrm{AB} \) is \( 4 \mathrm{~m} \) and its resistance is \( 10 \Omega \)
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