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

Options

A. Vertically downwards
B. Vertically Upwards
C. Towards Right
D. None of these

Answer

A

Explanation

The direction of current (I) is opposite to the direction of electron beam as shown in figure. Since the beam is deflected to the right side, the force (F) acting on the beam is as shown. Applying Fleming's left rule, it is found that magnetic field (B) is acting vertically downwards (i.e., perpendicular to the plane of the paper and directed inwards) as shown by `ox`.