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Potential at a point \( \mathrm{A} \) is 3 volt and at a point \( \mathrm{B} \) is 7 volt, an electron is moving towards A from B.
\( \mathrm{P} \)
(A) It must have some K.E. at B to reach A
W.
(B) It need not have any K.E. at B to reach A
(C) to reach \( \mathrm{A} \) it must have more than or equal to \( 4 \mathrm{eV} \) K.E. at B.
(D) when it will reach \( \mathrm{A} \), it will have K.E. more then or at least equal to \( 4 \mathrm{eV} \) if it was released from rest at \( \mathrm{B} \).
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