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Two resistances are connected in two gaps of a metre bridge. The balance point is \( 20 \mathrm{~cm} \) from the zero end. Aresistance
\( \mathrm{P} \) of \( 15 \Omega \) is connected in series with the smaller of the two. The

W null point shifts to \( 40 \mathrm{~cm} \). Then value of the smaller resistance is :
(A) \( 3 \Omega \)
(B) \( 6 \Omega \)
(C) \( 9 \Omega \)
(D) \( 12 \Omega \)
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