MCQ
In two separate experiments the neutral points due to two small magnets are at a distance of $r$ and $2 r$ in broad side-on position. The ratio of their magnetic moments will be
- A$4: 1$
- B$1: 2$
- C$2: 1$
- ✓$1: 8$
✓
Answer
Correct option: D.
$1: 8$
(d) At broad side-on position $B=\frac{M}{d^3}$$\therefore \frac{M_1}{d_1^3}=\frac{M_2}{d_2^3} \text { or } \frac{M_1}{r^3}=\frac{M_2}{8 r^3} \text { or } \frac{M_1}{M_2}=\frac{r^3}{8 r^3}=\frac{1}{8}$
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