If an electron starts from rest from a point at which potential is 50 volt to an

Question

If an electron starts 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

Options:

A . 3.2×10−10J

B . 3.2×10−18J

C . 1J

D . 1 dyne

Answer: Option B
:
B

K . E . = q_{0} (V_{A} - V_{B}) = 1.6 \times 10^{- 19} (70 - 50) = 3.2 \times 10^{- 18} J

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