Q. An electron enters a region where electrostatic field is $20N/C$ and magnetic field is $5T$. If electron passes undeflected through the region, the velocity of electron will be
A) $0.25ms^{- 1}$
B) $2ms^{- 1}$
C) $4ms^{- 1}$
D) $8ms^{- 1}$
Explanation
(c) $v = \frac{E}{B} = \frac{20}{5} = 4\ m/s$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.