Magnetic Effects Of Current Question 245
Question: A thin bar magnet of length 2 L is bent at the mid-point so that the angle between them is $ 60{}^\circ $ . The new length of the magnet is
Options:
A) $ \sqrt{2},L $
B) $ \sqrt{3},L $
C) $ 2,L $
D) $ L $
Show Answer
Answer:
Correct Answer: D
Solution:
[d] When the magnet is bent, the length of the magnet is: $ AC=AB+BC $ $ =L\sin \frac{\theta }{2}+L\sin \frac{\theta }{2} $ $ =2L\sin (\theta /2)=2L,sin(60{}^\circ /2) $ $ =2L\sin 30{}^\circ =L $
BETA
