Electrons flowing towards south are deflected towards east by a magnetic field. What is the direction of magnetic field? Explanation required.

Explanation: When an electron coming from the east enters a magnetic field downwards, which direction will the electron be deflected towards? ... But in case of electrons, the direction of force will be opposite to that in case of a positively charged particle. Therefore, the answer which you need is north.

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.

true tan speed = ang vel x radius