Now, with the idea reinforced by Thomson, he tried again and on 13 September 1845 he was successful in showing that a strong magnetic field could rotate the plane of polarisation, and moreover that the angle of rotation was proportional to the strength of the magnetic field. Faraday wrote (see for example):
Ngayon, sa mga ideya reinforced by Thomson, siya tried muli at sa 13 Setyembre 1845 siya ay matagumpay sa pagpapakita na ang isang malakas na batubalani patlang ay iikot ang katamin ng polarisation, at saka na ang mga anggulo ng pag-ikot ay batay sa lakas ng batubalani patlang . Faraday wrote (tingnan ang halimbawa):