Magnetic Effects Of Current Question 289
Question: A beam of well collimated cathode rays travelling with a speed of $ 5\times 10^{6},m{{s}^{-1}} $ enter a region of mutually perpendicular electric and magnetic fields and emerge undeviated from this region. If $ |B|,=0.02,T $ , the magnitude of the electric field is [Haryana CEE 1996]
Options:
A) $ 10^{5},V{{m}^{-1}} $
B) $ 2.5\times 10^{8},V{{m}^{-1}} $
C) $ 1.25\times 10^{10},V{{m}^{-1}} $
D) $ 2\times 10^{3},V{{m}^{-1}} $
Show Answer
Answer:
Correct Answer: A
Solution:
Using eE = evB
$ \Rightarrow E=vB=5\times 10^{6}\times 0.02=10^{5}V{{m}^{-1}} $
BETA
