- #1
smoking-frog
- 11
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Homework Statement
Calculate the Electric field of a Dipole from its Potential.
[tex] \vec E=-\operatorname{grad}(\Phi_D)[/tex]
Homework Equations
[tex]\Phi_D(\vec R)=\frac{Q}{4\pi\epsilon_0} \cdot \frac{\vec d \vec R}{R^3}[/tex]
The Attempt at a Solution
Hi all!
I am trying to calculate the electric Field of a Dipole from its Potential.
Specifically, I am trying to understand the following equation:[tex]\operatorname{grad}(\Phi_D)=\frac{Q}{4\pi\epsilon_0R^3}\cdot((\vec d\cdot \vec R )\cdot \operatorname{grad}(\frac{1}{R^3})+\frac{1}{R^3} \cdot\operatorname{grad}(\vec d \cdot \vec R))[/tex]
I tried re-writing the equation according to the Einstein Notation:
[tex]\operatorname{grad}(\Phi_D)=\frac{Q}{4\pi\epsilon_0}\cdot\frac{\partial}{\partial R_j}\frac{d_k R_l}{(R_i R_i)^{\frac{3}{2}}}[/tex]
Is that correct? If so, how will I go about proving the above identity?
Thank you all for your help!