What is the velocity of a beam of electrons that goes undeflected when moving perpendicular to an electric and magnetic fields. E⃗ E→ and B⃗ B→ are also perpendicular to each other and have magnitudes 8500 V/mV/m and 6.3×10−3 TT , respectively.

The given question is incomplete. The complete question is as follows.

What is the velocity of a beam of electrons that goes undeflected when moving perpendicular to an electric and magnetic fields. E⃗ E→ and B⃗ B→ are also perpendicular to each other and have magnitudes 8500 V/mV/m and 6.3×10−3 TT , respectively.

What is the radius of the electron orbit if the electric field is turned off?

Explanation:

It is known that,

           v =

              =

              = 1349206 m/s

Also,     r =

               =

               =

or,            = m

Thus, we can conclude that velocity of a beam of electrons that goes undeflected is m.