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 a strong magnetic field to your right side. What is the direction of magnetic field ?

Imagine that you are sitting in a chamber with your back to one wall.

1.	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 a strong magnetic field to your right side. What is the direction of magnetic field ?
Answer» Solution :An ELECTRON beam moving horizontally from back wall towards the front wall is equivalent to a current flowing in the opposite DIRECTION (i.e., from front wall towards the back wall). The deflection of electron beam as SEEN by theobserveris tohis rightside and is shown in Fig. 13.6 . On applyingFleming.sleft - handrule we find thatthe magenticfieldis actingin vertically DOWNWARD direction.