Magnetism Question 63
Question: In two separate experiments the neutral points due to two small magnets are at a distance of r and 2r in broad side-on position. The ratio of their magnetic moments will be
[MP PMT 1985]
Options:
A) 4 : 1
B) 1 : 2
C) 2 : 1
D) 1 : 8
Show Answer
Answer:
Correct Answer: D
Solution:
At broad side-on position $ B=\frac{M}{d^{3}} $
$ \
Therefore ,\frac{M _{1}}{d _{1}^{3}}=\frac{M _{2}}{d _{2}^{3}}or\frac{M _{1}}{r^{3}}=\frac{M _{2}}{8r^{3}}or\frac{M _{1}}{M _{2}}=\frac{r^{3}}{8r^{3}}=\frac{1}{8} $
BETA
