Question

Imagine that you are sitting in a chamber with your back to one wall. An electron beam, moving horizontally from back wall towards the front wall, is deflected by strong magnetic field to your right side. What is the direction of magnetic field?

Answer 1

Fleming's left hand rule is used to determine the direction of magnetic field. The direction of electric current will be from front wall to back wall as it is opposite to the direction of electron. Since the direction of force is towards the right side, by applying Fleming’s left hand rule, we can conclude that the magnetic field inside the chamber is in downward direction.