Figure shows a balanced Wheatstone net. Now, it is disturbed by changing \( P \) to \( 11 \Omega...

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Figure shows a balanced Wheatstone net. Now, it is disturbed by changing \( P \) to \( 11 \Omega \). Which of the following steps will not bring the bridge to balance again?
(1) increasing \( R \) by \( 2 \Omega \)
(2) increasing \( S \) by \( 20 \Omega \)
(3) increasing \( Q \) by \( 10 \Omega \)
(4) making product \( R Q=2200(\Omega)^{2} \)
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