An electron (q = −e, mass m) accelerated from rest through a potential…

Question

An electron (q = −e, mass m) accelerated from rest through a potential difference V gains kinetic energy:

Accepted Answer

B. e V

1. Energy gained = work done by field = |q| V = e V.
2. Defines the electronvolt: 1 eV = energy gained by 1 e through 1 V = 1.6 × 10⁻¹⁹ J.
3. Speed: ½ m v² = e V ⇒ v = √(2 e V / m).
_Source: syllabus Physics Ch 2 §2.10 (work-energy with field)_

Answer

½ e V

Answer

2 e V

Answer

e V²

An electron (q = −e, mass m) accelerated from rest through a potential difference V gains kinetic energy:

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