I'm a high-school student taking my second semester of physics, so please excuse me if this sounds obvious. According to the solutions for a worksheet my teacher gave me, charge polarization generally occurs in insulators rather than conductors. From what I understand, this means that if you take a charged object and hold it near a ball, the +/- particles in the ball will separate (polarize) more readily if the ball is made of an insulative rather than conductive material.
How does this make sense given that it's harder for electrons to move around in an insulator? By that definition, wouldn't the electrons move more slowly towards one end of the ball, and thus the ball would polarize less readily?