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Adding space charge density as a function of the radius

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Hello everyone, I need to add this formula for the space charge density:

whereandwith

Could you tell me how to do it please? In the figure I found where to write the formula of the space charge density, but I need to know how to write the spherical coordinate r.



2 Replies Last Post 2023年10月20日 GMT+2 09:43
Robert Koslover Certified Consultant

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Posted: 10 months ago 2023年10月20日 GMT+2 01:42
Updated: 10 months ago 2023年10月20日 GMT+2 01:42

Simply expressrin Cartesian coordinates. E.g., see https://en.wikipedia.org/wiki/Spherical_coordinate_system

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Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
Simply express *r* in Cartesian coordinates. E.g., see https://en.wikipedia.org/wiki/Spherical_coordinate_system

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Posted: 10 months ago 2023年10月20日 GMT+2 09:43

Thank you for your useful suggestion @RobertKoslover.

Thank you for your useful suggestion @RobertKoslover.

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