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Potential Energy of a Point Charge Placed at a Point with Non Zero Potential

If an electro...

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

A

3.2 \times 10^{- 10} J

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B

3.2 \times 10^{- 18} J

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C

1 J

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D

1 d y n e

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Solution

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

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