Question

What is the velocity of a beam of electrons that goes undeflected when moving perpendicular to an electric and magnetic fields. E⃗ and B⃗ are also perpendicular to each other and have magnitudes 4100 V/m and 4.9×10−3 T , respectively. What is the radius of the electron orbit if the electric field is turned off?

Answer 1

Answers,

Velocity = 836734.7 m/s

Radius = 9.712 × 10^-4 m