Magnetic Effects Of Current Question 180
Question: An electron moves with a constant speed v along a circle of radius r. Its magnetic moment will be (e is the electron’s charge) [MP PMT 1994]
Options:
A) evr
B) $ \frac{1}{2}evr $
C) $ \pi r^{2}ev $
D) $ 2\pi rev $
Show Answer
Answer:
Correct Answer: B
Solution:
$ M=i\ (\pi r^{2})=\frac{ev}{2\pi r}\times \pi r^{2}\Rightarrow M=\frac{1}{2}evr $
BETA
