An electron beam moving with a speed of 2.5×10⁷ms⁻¹  enters into the magnetic field directed perpendicular to its direction of motion. The magnetic induction of the field is 4×10⁻³wb/m². What is the intensity of the electric field applied so that the electron remains undeflected due to the magnetic field ?

10⁵ N/C

E = vB

v = 2.5×10⁷ms⁻¹ ; B = 4×10⁻³wb/m²

E = 10⁵ N/C