Q. A uniform electric field and a uniform magnetic field are produced, pointing in the same direction. If an electron is projected with its velocity pointing in the same direction
A) The electron will turn to its right
B) The electron will turn to its left
C) The electron velocity will increase in magnitude
D) The electron velocity will decrease in magnitude
Explanation
(d) Since electron is moving parallel to the magnetic field, hence magnetic force on it $F_{m} = 0$
The only force acting on the electron is electric force which reduces it’s speed
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.