The given Wheatstone bridge is showing no deflection in the galvanometer joined between the poin...

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The given Wheatstone bridge is showing no deflection in the galvanometer joined between the points \( B \) and D (Figure). Calculate the value of \( R \).
(A) \( 25 \Omega \)
(B) \( 50 \Omega \)
(C) \( 40 \Omega \)
(D) \( 100 \Omega \)
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