The meter-bridge wire \( A B \) shown in figure is \( 50 \mathrm{~cm} \) long. When \( A D=30 \m...
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 \( R \).
(A) \( 1 \Omega \)
(B) \( 2 \Omega \)
(C) \( 3 \Omega \)
(D) \( 4 \Omega \)
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