NDA2018General AbilityGeneral ScienceActual
If a free electron moves through a potential difference of 1 kV , then the energy gained by the electron is given by
Options
- A1.6 10⁻¹⁹ ~J
- B1.6 10⁻¹⁶ ~J
- C1 10⁻¹⁹ ~J
- D1 10⁻¹⁶ ~J
Correct answer
B. 1.6 10⁻¹⁶ ~J
Step-by-step solution
Since the electron moves through a potential difference, the gain in kinetic energy will be equal to the Potential energy lost by the electron. The energy can be given by the formula E = VQ , where ' E ' represents potential energy in joules, and ' Q ' represents charge in coulombs. aligned & E =(1 kV ) (1.6 10⁻¹⁹ ~J ) & E =1.6 10⁻¹⁶ ~J aligned