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

a) must be equal to 20V/cm

b) may be equal to 20V/cm

c) may be greater than 20V/cm

d) may be greater than 20V/cm

i think all a , b and c should be correct but the answer given in the book is b and c . it will be b or c depending upon whether the V vs x graph is concave or convex . and b option will be correct for straight line graph .

what is incorrect in my approach ?

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# Electric potential homework problems

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