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184_notes:examples:week3_particle_in_field [2018/05/24 14:59] – [Example: Particle Acceleration through an Electric Field] curdemma | 184_notes:examples:week3_particle_in_field [2021/05/19 15:00] – schram45 | ||
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\Delta U &= q\Delta V &&&&&& | \Delta U &= q\Delta V &&&&&& | ||
\end{align*} | \end{align*} | ||
- | * We can write the change in electric potential (from an initial location " | + | * We can write the change in electric potential (from an initial location "$i$" to a final location "$f$") as |
\begin{align*} | \begin{align*} | ||
\Delta V=-\int_i^f \vec{E}\bullet d\vec{r} &&&&&& | \Delta V=-\int_i^f \vec{E}\bullet d\vec{r} &&&&&& | ||
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\vec{F}=q\vec{E} &&&&&&&& | \vec{F}=q\vec{E} &&&&&&&& | ||
\end{align*} | \end{align*} | ||
+ | |||
+ | ===Assumptions=== | ||
+ | * Point Charge: Allows us to use the electric potential equation, and the problem does not specify anything otherwise. | ||
+ | * Constant charge: Simplifies the value of charge, meaning it is not charging or discharging over time. | ||
+ | * Electric field is constant in accelerator: | ||
+ | * No gravitational effects: Gravity would be another force acting on our charge in this situation, however for simplicity we are not told any mass and neglect gravity for this problem. | ||
+ | * Conservation of energy: No energy is being added or taken out of the system. This means as the charge loses electric potential energy as it leaves the accelerator, | ||
===Representations=== | ===Representations=== | ||
- | {{ 184_notes: | + | [{{ 184_notes: |
+ | |||
+ | <WRAP TIP> | ||
+ | ===Assumption=== | ||
+ | No gravitational effects are being considered in this problem. Typically point charges are really small and have negligible masses. This means that the gravitational force would be very small compared to the electric force acting on the particle in the accelerator and can be excluded from the calculations and representation. | ||
+ | </ | ||
===Goal=== | ===Goal=== | ||
Line 33: | Line 45: | ||
<WRAP TIP> | <WRAP TIP> | ||
=== Approximation === | === Approximation === | ||
- | We will approximate the particle as a point charge. We already know it is a " | + | We will approximate the particle as a //__point charge__//. We already know it is a " |
</ | </ | ||
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& | & | ||
\end{align*} | \end{align*} | ||
+ | |||
+ | <WRAP TIP> | ||
+ | ===Assumption=== | ||
+ | Assuming the electric field is constant within the accelerator allows the $E_0$ to be taken out of the integral in this problem. | ||
+ | </ | ||
+ | |||
The physical significance of this result is that the particle " | The physical significance of this result is that the particle " | ||
+ | |||
+ | <WRAP TIP> | ||
+ | ===Assumption=== | ||
+ | Assuming there is a conservation of energy allows the total change in energy of the system to be zero. | ||
+ | </ | ||
+ | |||
Remember that $\vec{v}_i=0$, | Remember that $\vec{v}_i=0$, | ||
\begin{align*} | \begin{align*} |