An electron with an initial speed of is brought to rest by an electric field.
a. Did the electron move into a region of higher potential or lower potential?
b. What was the potential difference that stopped the electron?
a. The electron has shifted into a lower-potential zone.
Given : Electron's initial speed :
Theory used :
From the equation of conservation of energy, we have :
a. Because the kinetic energy of the system has reduced, the potential energy has increased. The product of the charge and the potential difference equals the change in potential energy. Because the electron is negatively charged, the potential energy must increase in order for the potential energy to grow.
As a result, the electron has shifted into a lower-potential zone.
b. As a result of energy conservation we have :
Substituting , we have :
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