AMU Engineering 2018 solved paper Solved Paper

From the graph, given in the question.
The slope of the electric potential versus distance graph,

dV

dx

=

−500

20×10−2

V∕m
=−2.5×103V∕m
Since, we know that
Electric field, E=−

dV

dx

‌‌‌‌ (at a point)
E=2.5×103V∕m
∴ The electric force on the electron at that point
F=eE
=1.6×10−19×25×103
=4×10−16N