In the potentiometer arrangement shown in figure, null point is obtained at length $\mathcal{l}$ . Match the following ($E_2$ is ideal)

	LIST-I		LIST-II
P)	If $E_1$ is increased	1)	$\mathcal{l}$ should increase
Q)	If R is increased	2)	$\mathcal{l}$ should decrease
R)	If $E_2$ is increased	3)	$\mathcal{l}$ should remain the same to again get null point
S)	If r is shunted	4)	$\mathcal{l}$ becomes zero