In the potentiometer arrangement shown in figure, null point is obtained at length l.
Column I Column II
i. If E₁ is increased p. l should increase
ii. If R is increased q. I should decreases
iii. If E₂ 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.

Moderate

Solution

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

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Column I		Column II
i.	If E₁ is increased	p.	l should increase
ii.	If R is increased	q.	I should decreases
iii.	If E₂ is increased	r.	l should remain the same to again get the null point