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In the experimental setup of metre bridge shown in the figure, the null point is obtained at a dsitance of \( 40 \mathrm{~cm} \) from \( A \). If a \( 10 \Omega \) resistor is connected in series with \( R_{1} \), the null point shifts byu \( 10 \mathrm{~cm} \). The resistance that should be connected in parallel with \( \left(R_{1}+10\right) \Omega \) such that the null point shifts back to its initial position is :
img src=https://penpencil-static-content.s3.ap-south-1.amazonaws.com/5eb393ee95fab7468a79d189/1p895eygvqiyeoyy72fw19nms.png /
(1) \( 20 \Omega \)
(2) \( 40 \Omega \)
(3) \( 60 \Omega \)
(4) \( 30 \Omega \)
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