The electric field in the region defined by the y-z plane and the negative x axis is given by E = −ax, where a is a constant. (There is no field for positive values of x.) As −x increases in magnitude, relative to V = 0 at the origin, the electric potential in the region defined above is
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a decreasing function proportional to −|x2|.
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a decreasing function proportional to −|x|.
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constant.
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an increasing function proportional to +|x|.
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an increasing function proportional to +|x2|.