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

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must be equal to 20 V cm-1

may be equal to 20 V cm-1

may be greater than 20 V cm-1

may be less than 20 V cm-1

answer is B.

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Detailed Solution

If direction of field is along the x-axis then its magnitude will be 20 V/cm other wise greatest than that.

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