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Hi All,

I need mathematical help from the topic electrical potential for lectures on physics by Richard Feynman.

Need some help to understand mathematical method used here.

question :

1) From electrical potential.png

( how this partial differential of ( -p/4∏ε (z/r^3)) with respect to z

⇔ -p/4∏ε (1/r^3 - 3z^2 / r^5) ?

similarly how to do partial differentiation with respect to x

2) From perpendicular_field.png

( how this E = p/4∏ε * 3z/r^5 √(x^2 + y^2) ⇔ p/4∏ε * (3 cosθsinθ/r^3)

Please look for attachments

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# Mathematical method in electrical potential ?

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