MCQ
At two places $A$ and $B$ using vibration magnetometer, a magnet vibrates in a horizontal plane and its respective periodic time are $2 \sec$ and $3 \sec$ and at these places the earth's horizontal components are $H_A$ and $H_B$ respectively. Then the ratio between $H_A$ and $H_B$ will be
- A$9 : 4$
- B$ 3 : 2$
- ✓$4 : 9$
- D$2 : 3$
