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jerro
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Sometimes we set potential to equal zero at infinity, other times at the origin. What's the general rule of thumb here-how do I know which to choose when doing a problem?
With respect, the only reason for potential being zero at any point is because you've chosen it to be so. Specifically, you choose the arbitrary constant when you integrate the field strength due to the charge configuration in such a way as to make the potential zero at a point of your choice. Choosing that point to be a very way from your charge configuration ('at infinity') makes formulae for potential easier than otherwise.aftershock said:You generally pick a point where the potential is zero.
The electric potential is usually set to zero at a reference point, which is often chosen to be at infinity or at a point where the electric field is known to be zero. This reference point is arbitrary and does not affect the physical behavior of the system.
No, the electric potential can only be set to zero at a reference point. If the reference point is chosen to be inside the system, the potential at other points in the system will be affected.
Setting the electric potential to zero allows us to measure the potential at different points in the system relative to the reference point. This helps us understand the behavior of the electric field and the flow of electric charge in the system.
Yes, the reference point can be changed as long as it does not affect the physical behavior of the system. However, it is common practice to choose a reference point that simplifies the mathematical calculations.
Yes, the electric potential can be positive or negative depending on the location and the charge distribution in the system. A negative potential indicates that the electric field is directed towards the reference point, while a positive potential indicates that the electric field is directed away from the reference point.