Both sides previous revision Previous revision Next revision | Previous revision |
184_notes:examples:week2_electric_potential_positive_point [2018/01/24 17:03] – tallpaul | 184_notes:examples:week2_electric_potential_positive_point [2018/05/17 16:48] (current) – curdemma |
---|
===== Electric Potential from a Positively Charged Balloon ===== | [[184_notes:pc_potential|Return to Electric Potential]] |
Suppose we have a positively charged balloon with total charge Q=5⋅10−9 C. What is the electric potential (also called voltage) at a point P, which is a distance R=50 cm from the center of the balloon? | ===== Example: Electric Potential from a Positively Charged Balloon ===== |
| Suppose we have a positively charged balloon with total charge $Q=5.0\cdot 10^{-9} \text{ C}.Whatistheelectricpotential(alsocalledvoltage)atapointP,whichisadistanceR=50 \text{ cm}$ from the center of the balloon? |
| |
===Facts=== | ===Facts=== |
* The balloon has total charge Q=5⋅10−9 C. | * The balloon has total charge $Q=5.0\cdot 10^{-9} \text{ C}$. |
* The point P is a distance R=50 cm away from the center of the balloon. | * The point P is a distance R=50 cm away from the center of the balloon. |
* The electric potential due to a point charge can be written as V=14πϵ0qr, where q represents the charge and r is the distance. | * The electric potential due to a point charge can be written as V=14πϵ0qr, where q represents the charge and r is the distance. |
</WRAP> | </WRAP> |
| |
{{ 184_notes:2_potential_positive_balloon.png?150 |Charged Balloon, and Point P}} | [{{ 184_notes:2_potential_positive_balloon.png?150 |Charged Balloon, and Point P}}] |
| |
===Goal=== | ===Goal=== |
<WRAP TIP> | <WRAP TIP> |
=== Assumption === | === Assumption === |
The electric potential infinitely far away from the balloon is 0 V. Read [184_notes:superposition#Superposition_of_Electric_Potential|here]] for why this is important. | The electric potential infinitely far away from the balloon is 0 V. Read [[184_notes:superposition#Superposition_of_Electric_Potential|here]] for why this is important. |
</WRAP> | </WRAP> |
| |