Question

In sum and difference method in 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

Answer 1

Answer: (B)

Opposite poles of both magnets are on same sides

Answer 2

In sum position

$T _ { S } = 2 \pi \sqrt { \frac { I _ { s } } { \left( M _ { 1 } + M _ { 2 } \right) B _ { H } } }$

In difference position

$T _ { d } = 2 \pi \sqrt { \frac { I _ { d } } { \left( M _ { 1 } - M _ { 2 } \right) B _ { H } } }$

It is clear that $T _ { d } > T _ { s }$