In the given potentiometer circuit, length of the wire \( A B \) is \( 3 \mathrm{~m} \) and resi...
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In the given potentiometer circuit, length of the wire \( A B \) is \( 3 \mathrm{~m} \) and resistance is \( R=4.5 \Omega \). The length \( A C \) for no deflection in galvanometer is
(A) \( 2 \mathrm{~m} \)
(B) \( 1.8 \mathrm{~m} \)
(C) dependent on \( r_{1} \)
(D) none of these
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