Magnetic Effects Of Current Question 272
Question: A uniform magnetic field acts at right angles to the direction of motion of electrons. As a result, the electron moves in a circular path of radius 2 cm. If the speed of the electrons is doubled, then the radius of the circular path will be [CBSE PMT 1991]
Options:
A) 2.0 cm
B) 0.5 cm
C) 4.0 cm
D) 1.0 cm
Show Answer
Answer:
Correct Answer: C
Solution:
$ r=\frac{mv}{qB}\Rightarrow r\propto v,\ ,\ \Rightarrow r_{2}=2r_{1}=2\times 2=4cm $
BETA
