Magnetism Question 244
Question: A magnet of magnetic moment M is rotated through $ 360^{o} $ in a magnetic field H, the work done will be
Options:
A) $ MH $
B) $ 2MH $
C) $ 2\pi MH $
D) Zero
Show Answer
Answer:
Correct Answer: D
Solution:
[d] $ U _{i}=-MB,\cos ,0^{o}=-MB $ and $ U _{f}=-MB,\cos ,360^{o}=-MB $ Now, $ W=U _{f}-U _{i}=-MB-(-MB)=0 $
BETA
