1. The problem statement, all variables and given/known data Describe the Faraday effect as it might be observed in a glass cell contained within a solenoid 2. Relevant equations 3. The attempt at a solution When a glass cell is immersed in a strong magnetic field, the plane of vibration of light waves is rotated. When the solenoid receives the electrical current it sets up a magnetic field in the glass cell. The strength of the field varies in proportion to the amplitude of the signal current. As the waves proceed through the glass cell the plane in which they vibrate is rotated by an amount that varies with the strength of the magnetic field and hence with the strength of the electrical current.