First slide

Electrostatic potential energy

Question

A proton is accelerated through 50,000 V. Its energy will increase by

Moderate

A

5000 eV
B

$8 \times 10^{- 15} J$
C

5000 J
D

50,000 J

Solution

$Kinetic energy K = Q. V \Rightarrow K = (+ e) (50000 V)$
$= 50000 eV = 50000 \times 1 .6 \times 10^{- 19} J = 8 \times 10^{- 15} J$

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