Solution
= Solution
The far field of a dipole is $[3(p\cdot\widehat x)\widehat x-p]/(4πε_0r^3)$. Comparison yields the induced <electric dipole moment>
$$
\boxed{p=4πε_0a^3{ε-ε_0\over ε+2ε_0}E_0.}
$$
= Solution
The far field of a dipole is $[3(p\cdot\widehat x)\widehat x-p]/(4πε_0r^3)$. Comparison yields the induced <electric dipole moment>
$$
\boxed{p=4πε_0a^3{ε-ε_0\over ε+2ε_0}E_0.}
$$