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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 less than 20 V/cm

must be equal to 20 V/cm

may be equal to 20 V/cm

may be greater than 20 V/cm

answer is C.

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Detailed Solution

$E_{x} = - \frac{dV}{dx} = - \frac{(80 - 120)}{(1 - (- 1))} = 20 V / cm$

There may be presence of $E_{y} and E_{z}$ components too.

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