Q. A beam of electrons is moving with constant velocity in a region having electric and magnetic fields of strength $20\ Vm^{- 1}$ and $0.5\ T$ at right angles to the direction of motion of the electrons. What is the velocity of the electrons?
A) $20\ ms^{- 1}$
B) $40\ ms^{- 1}$
C) $8\ ms^{- 1}$
D) $5.5\ ms^{- 1}$
Explanation
(b) $v = \frac{E}{B} = \frac{20}{0.5} = 40\ m/sec$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.