In the potentiometer experiment shown in figure, the null point length is \( l \). Choose the co...

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In the potentiometer experiment shown in figure, the null point length is \( l \). Choose the correct options given below.
(a) If jockey \( J \) is shifted towards right, \( l \) will increase
(b) If value of \( E_{1} \) is increased, \( l \) is decreased
(c) If value of \( E_{2} \) is increased, \( l \) is increased
(d) If switch \( S \) is closed, \( l \) will decrease
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