[tex]v = \frac{er}{r + a} [/tex]
Find R in image
![texv fracerr a tex Find R in image class=](https://us-static.z-dn.net/files/d78/0747d5db0e61d840294fdec04929cca6.jpg)
Step-by-step explanation:
[tex]V = \frac{ER}{R + a} [/tex]
[tex]V(R+a)=ER[/tex]
[tex]VR + Va=ER[/tex]
[tex]Va= ER-VR[/tex]
[tex]Va=R(E-V)[/tex]
[tex]R = \frac{Va}{E-V} [/tex]