A charged insulator disc is under induction. Will there be a torque on its center? Perhaps one could use Faraday’s law to compute the torque. But is Faraday’s law valid for this application? Nevertheless, let us compute with Faraday’s law.

Please read the article at
Faraday’s torque experiment
http://pengkuanem.blogspot.com/2012/11/faradays-torque-experiment.html
or http://www.academia.edu/2173815/Faradays_torque_experiment