The meter-bridge wire \(A B\) shown in figure is \(50 \mathrm{~cm}\) long. When \(A D=30 \mathrm....

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The meter-bridge wire \(A B\) shown in figure is \(50 \mathrm{~cm}\) long. When \(A D=30 \mathrm{~cm}\), no deflection occurs in the galvanometer. Find \(R\).
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