Dual Nature Of Light Question 49
Question: 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 [CBSE PMT 1996]
Options:
A) 20 $ m{{s}^{-1}} $
B) 40 $ m{{s}^{-1}} $
C) 8 $ m{{s}^{-1}} $
D) 5.5 $ m{{s}^{-1}} $
Show Answer
Answer:
Correct Answer: B
Solution:
$ v=\frac{E}{B}=\frac{20}{0.5}=40,m/\sec . $
BETA
