Q. In sum and difference method vibration magnetometer, the time period is more if
A) Similar poles of both magnets are on same sides
B) Opposite poles of both magnets are on same sides
C) Both magnets are perpendicular to each other
D) Nothing can be said
Explanation
(b) In sum position: $T_{S} = 2\pi\sqrt{\frac{I_{3}}{\left( M_{1} + M_{2} \right)B_{H}}}$
In difference position: $T_{d} = 2\pi\sqrt{\frac{I_{d}}{\left( M_{1} - M_{2} \right)B_{H}}}$
It is clear that $T_{d} > T_{s}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.