First slide

Potential energy

Question

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

Easy

A

3.2 X 10^-10 J
B

3.2 X 10^-18 J
C

1 N
D

1 dyne

Solution

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

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