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Q. In the potentiometer arrangement shown in figure, null point is obtained at length $l$.
image
Column I Column II
i If $E_{1}$ is increased p $l$ should increase
ii If $R$ is increased q $l$ should increase
iii If $E_{2}$ is increased r $l$ should remain the same to again get the null point

Now, match the given columns and select the correct option from the codes given below.

Current Electricity

Solution:

(b) For potentiometer circuit, $E=x l_{1}$
$x$ depends only on primary circuit
(i) $E_{1} \uparrow \Rightarrow x \uparrow \Rightarrow l_{1} \downarrow$ if secondary circuit remains same
(ii) $R \uparrow \Rightarrow x \downarrow \Rightarrow l_{1} \uparrow$ if secondary circuit remains same
(iii) $E_{2} \uparrow=l_{1} \uparrow$ if $x$ remains same