If an electron moves from rest from a point at which potential is $50\, volt$ to another point at which potential is $70\, volt$, then its kinetic energy in the final state will be
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(b) $\,{\rm{K}}{\rm{.E}}{\rm{.}}\, = {q_0}({V_A} - {V_B}) = 1.6 \times {10^{ - 19}}(70 - 50) = 3.2 \times {10^{ - 18}}J$
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