# Is Time-Dependent Electric Current Simulation Possible in COMSOL?

• ajaymohan251
In summary, variable potential in COMSOL is a feature that allows for solving problems with changing electric potentials. It differs from constant potential in that it allows for more realistic and complex scenarios, leading to more accurate simulations. It can be used in various types of simulations, but careful consideration of the physics involved is important. To set it up, a function or expression must be defined. COMSOL also allows for visualization and analysis of variable potential in simulation results.
ajaymohan251
TL;DR Summary
In this COMSOL model, I have a part given potential (-800v) while the other is grounded.

Does anyone have an idea on how to change the potential alternately from +800v to -800v with a waveform function?

V0*wv1(sin(f*t))

Does this equation satisfy this query with a frequency given as 2.81 MHz?

Any suggestions?

This is actually for a particle tracing to be done further for a proton.
Kindly find the images for better understanding.

You'll have to use a model that allows for time-dependent solutions, probably Electric Currents in your case.

## What is variable potential in COMSOL?

Variable potential in COMSOL refers to the ability to assign a varying potential to different parts of a simulation model. This allows for the simulation of complex systems where the potential changes in different regions.

## How is variable potential implemented in COMSOL?

Variable potential can be implemented in COMSOL through the use of boundary conditions, electric potential variables, and user-defined functions. These tools allow for the creation of a customized potential profile within a simulation model.

## What types of simulations can benefit from using variable potential?

Simulations that involve systems with varying potentials, such as electrochemical reactions, semiconductor devices, and fluid flow with charged particles, can benefit from using variable potential in COMSOL. It allows for a more accurate representation of the system and its behavior.

## Can variable potential be used in conjunction with other simulation features in COMSOL?

Yes, variable potential can be used in combination with other simulation features in COMSOL, such as material properties, boundary conditions, and physics interfaces. This allows for a more comprehensive and accurate simulation of complex systems.

## Are there any limitations to using variable potential in COMSOL?

One limitation of using variable potential in COMSOL is that it requires a thorough understanding of the underlying physics and mathematical equations governing the system. Additionally, it may require more computational resources and longer simulation times compared to simpler models.

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