Magnetism Question 254
Question: Two magnets of same size and mass make respectively 10 and 15 oscillations per minute at certain place. The ratio of their magnetic moments is
Options:
A) 4 : 9
B) 9 : 4
C) 2 : 3
D) 3 : 2
Show Answer
Answer:
Correct Answer: A
Solution:
[a] $ T _{1}=\frac{60}{10}=6s $ and $ T _{2}=\frac{60}{15}=4s $ For identical magnets, $ \frac{M _{1}}{M _{2}}=\frac{T _{2}^{2}}{T _{1}^{2}}=\frac{4^{2}}{6^{2}}=\frac{16}{36}=\frac{4}{9}. $
BETA
