A beam of electrons is moving with constant velocity in a region having electric and magnetic fields of strength 20Vm^-1 and 0.5T at right angles to the direction of motion of the electrons. What is…

Question

A beam of electrons is moving with constant velocity in a region having electric and magnetic fields of strength 20Vm^-1 and 0.5T at right angles to the direction of motion of the electrons. What is the velocity of the electrons?

Accepted Answer

Correct answer: D. (d) Electric field (E) =20V/m and magnetic field (B )=0.5 T. The force on electron in a magnetic field = evB Force on electron on an electric field = eE Since the electron is moving with constant velocity, therefore the resultant force on electron is zero. i.e., eE= evB ⇒v= ElB=20/0.5=40ms^-1

$A beam of electrons is moving with constant velocity in a region having electric and magnetic fields of strength 20 V m^{- 1} and 0.5 T at right angles to the direction of motion of the electrons. What is the velocity of the electrons?$

Solution

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