# 2D frequency domain forward modeling

**URL:** <https://simpeg.discourse.group/t/2d-frequency-domain-forward-modeling/175>\
**Category:** Electromagnetics\
**Created:** [January 11, 2021, 7:56pm UTC](https://simpeg.discourse.group/t/2d-frequency-domain-forward-modeling/175 "2021-01-11T19:56:40Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![s111nazari](https://avatars.discourse-cdn.com/v4/letter/s/58f4c7/32.png) [@s111nazari](https://simpeg.discourse.group/u/s111nazari)\
**Post date:** [January 11, 2021, 7:56pm UTC](https://simpeg.discourse.group/t/2d-frequency-domain-forward-modeling/175/1 "2021-01-11T19:56:40Z")

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Hello  
good day  
I’m trying to write an EM code for 2D frequency domain forward modeling using finite difference, and I need little help for the primary field, because I don’t know the exact equation that I should use, and how to use it…  
thank you all in advance .