A charged particle moving with a uniform velocity `vecv` enters a region where uniform electric and magnetic fields `vecE` and `vecB` are present. It passes through the region without any change in its velocity. What can we conclude about the (i) relative direction of `vecE`, `vecV` and `vecB`? (ii) magnetic of `vecE` and `vecB`?
or
Find the condition under which the charged particle moving with different speeds in the presence of electric and magnetic field vectors can be used to select charged particles of a particular speeds.