What is the velocity of a beam of electrons that goes undeflected when moving perpendicular to an electric and magnetic fields. e--> and b--> are also perpendicular to each other and have magnitudes 7900v/m and 9.1*10^-3t , respectively.

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

Explanation:

Given that,

Electric field, E = 7900 V/m

Magnetic field,

(a) Let v is the velocity of a beam of electrons that goes undeflected when moving perpendicular to an electric and magnetic fields. The magnitude of electric force and the magnetic force balance each other as :

(b) Let r is the radius of the electron orbit. The radius of the motion of electron is given by :

Hence, this is the required solution.

there was no answer choices but i think its representative

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