Question

If a beam of electrons travels in a straight line in a certain region. Can we say there is no magnetic field?

Answer 1

We cannot necessarily say there is no magnetic field.

- It may be possible that the magnetic field is zero in that region but this is not the confirmed case in every situation.

- One possibility is that the magnetic field is parallel to the direction of movement of the electron.

- In this case, the electron does not changes its direction but still magnetic field is present in the region.

Answer 2

•IF A BEAM OF ELECTRON TRAVLES IN STRAIGHT LINE IN A CERTAIN REGION. It is NOT necessary FOR THE MAGNETIC FIELD IN THAT REGION TO BE ZERO.

• IF A BEAM OF ELECTRONS TRAVEL IN STRAIGHT LINE IN A CERTAIN REGION, It may mean that force in that REGION is zero but it is NOT NECESSARY THAT MAGNETIC FIELD IN THAT REGION IS ZERO.