In the potentiometer arrangement shown in figure, null point is obtained at length l.Now, match the given columns and select the correct option from the codes given below.

For potentiometer circuit, E=xl1x depends only on primary circuiti  E1 ↑ ⇒  x↑  ⇒ l1  ↓  if secondary circuit remains sameii  R ↑ ⇒  x↓  ⇒ l1  ↑ if secondary circuit remains sameiii  E2 ↑ ⇒  l1↑ if x remains same