The variation of potential with distance R from the fixed point is shown in Fig. The electric field at $R = 5 m$ is :

$2.5$ V $m^{- 1}$
$- 2.5$ V $m^{- 1}$
$0.4$ V $m^{- 1}$
$- 0.4$ V $m^{- 1}$

- 0.4

m^{- 1}

2.5

m^{- 1}

- 2.5

m^{- 1}

0.4

m^{- 1}

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