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| 184_notes:examples:week2_electric_potential_negative_point [2018/01/24 17:42] – tallpaul | 184_notes:examples:week2_electric_potential_negative_point [2018/05/17 16:49] (current) – curdemma | ||
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| - | ===== Electric Potential from a Negatively Charged Balloon ===== | + | [[184_notes: |
| + | ===== Example: | ||
| Suppose we have a negatively charged balloon with total charge Q=−5.0⋅10−9 C. What is the electric potential (also called voltage) at a point P, which is a distance R=20 m from the center of the balloon? | Suppose we have a negatively charged balloon with total charge Q=−5.0⋅10−9 C. What is the electric potential (also called voltage) at a point P, which is a distance R=20 m from the center of the balloon? | ||
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| We assume P lies outside of the balloon. This is obvious, as P is a distance R=20 m away from the center of the balloon. | We assume P lies outside of the balloon. This is obvious, as P is a distance R=20 m away from the center of the balloon. | ||
| </ | </ | ||
| - | {{ 184_notes: | + | [{{ 184_notes: |
| ===Goal=== | ===Goal=== | ||
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| <WRAP TIP> | <WRAP TIP> | ||
| === Assumption === | === Assumption === | ||
| - | The electric potential infinitely far away from the balloon is 0 V. Read [184_notes: | + | The electric potential infinitely far away from the balloon is 0 V. Read [[184_notes: |
| </ | </ | ||