Magnetic Effects Of Current Question 395
Question: A beam of electrons is moving with constant velocity in a region having simultaneous perpendicular electric and magnetic fields of strength $ 20,V{{m}^{-1}} $ and 0.5 T respectively at right angles to the direction of motion of the electrons. Then the velocity of electrons must be
Options:
A) $ 8,m/s $
B) $ 20,m/s $
C) $ 40,m/s $
D) $ \frac{1}{40},m/s $
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Answer:
Correct Answer: C
Solution:
[c] The electron moves with constant velocity without deflection. -Hence, force due to magnetic field is equal and opposite to force due to electric field.
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