Potential atapoint A is 3 volt and atapoint B is 7 volt ,an electron is moving towards A from B.

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2. Electric Potential and Capacitance

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Potential atapoint $A$ is $3 $ $ volt$ and atapoint $B$ is $7$ $volt$,an electron is moving towards $A$ from $B.$

A

It must have some $K.E. $ at $B$ to reach $A$

B

It need not have any $K.E.$ at $B$ to reach $A$

C

to reach $A$ it must have more than or equal to $4$ $eV$ $K. E.$ at $B.$

D

$A$ and $C$ both

Solution

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

$K_{f}-K_{i}=U_{i}-U_{f}$

$K_{f}=\left(U_{i}-U-f\right)+K_{i}$

$K_{f}=4 e V+K_{i}$

Standard 12

Physics

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