Potential atapoint $A$ is $3 $ $ volt$ and atapoint $B$ is $7$ $volt$,an electron is moving towards $A$ from $B.$
Medium
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Field is in same direction
$U_{A}=-3 e V, U_{B}=-7 e V$
For $B$ to $A$ it is moving towards higher potential energy
$K_{f}-K_{i}=U_{i}-U_{f}$
$K_{f}=\left(U_{i}-U-f\right)+K_{i}$
$K_{f}=4 e V+K_{i}$
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