The electric potential decreases uniformly from 120 V to 80 V as one moves on the X-axis from x = -1 cm to x = +1 cm. The electric field at the origin

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The electric potential decreases uniformly from 120 V to 80 V as one moves on the X-axis from x = -1 cm to x = +1 cm. The electric field at the origin

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may be equal to 20 V/cm

must be equal to 20 V/cm

may be less than 20 V/cm

may be greater than 20 V/cm

answer is A.

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Detailed Solution

$E = - \frac{d V}{d r}$ , $E_{x} = \frac{40}{2} = 20 V / C m$ ,

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