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# A cell in secondary circuit gives null deflection for $2.5\;m$ length of potentiometer having 10 m length of wire. If the length of the potentiometer wire is increased by 1 m without changing the cell in the primary, the position of the null point now is :

$\begin {array} {1 1} (1)\;3.5\;m & \quad (2)\;3\;m \\ (3)\;2.75\;m & \quad (4)\;2.0\;m \end {array}$

(3) 2.75 m