I am currently an apprentice studying electrical and electronic engineering and i am struggling to find an answer for this question could anyone help?

 

Depending on the context....it could be complex and involved. Have you an specific example?

 

Hi,

I could take a guess but you have not supplied any information about how you might go about doing it so it's just a guess for your course.
The usual takes the form of the surface integral explanation. If you have never done that then you need to explain how you think you should go about doing it.