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Properties of Field Lines

The variation...

Question

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

A

2.5

V

m^{- 1}

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B

- 2.5

V

m^{- 1}

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C

0.4

V

m^{- 1}

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D

- 0.4

V

m^{- 1}

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Solution

The correct option is A $2.5$ V $m^{- 1}$
$E = - \frac{d V}{d r}$
$E = - \frac{0 - 5}{6 - 4}$
$E = 2.5 V / m$

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