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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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