Question

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

Answer 1

Fleming’s left-hand rule:

1. The left and right-hand thumb rules were created by John Ambrose Fleming in the late 1800s. Both of these rules were found by John and named after him. Fleming's left and right-hand rules became well-known as a result of the regulations.
2. If the thumb, forefinger, and middle finger of the left hand are mutually perpendicular to each other, according to Fleming's left-hand rule. The middle finger symbolizes the current direction, while the forefinger represents the direction of a magnetic field. The force's direction is represented by the thumb.
   

The direction of the Magnetic field:

1. The magnetic field is vertically downward in direction. Because negatively charged electrons are travelling from the back wall to the front wall, the current direction is from front to back. The magnetic force is directed to the right.
2. Using Fleming's left-hand rule, the magnetic field within the chamber is pointing downward.
   

Hence, the magnetic field direction inside the chamber is downward.