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Magnetism — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsMagnetism1 Mark
MCQ
In sum and difference method in vibration magnetometer, the time period is more if
  • A
    Similar poles of both magnets are on same sides
  • ✓
    Opposite poles of both magnets are on same sides
  • C
    Both magnets are perpendicular to each other
  • D
    Nothing can be said
✓

Answer

Correct option: B.
Opposite poles of both magnets are on same sides
In sum position : $T_S=2 \pi \sqrt{\frac{I_s}{\left(M_1+M_2\right) B_H}}$In difference position : $T_d=2 \pi \sqrt{\frac{I_d}{\left(M_1-M_2\right) B_H}}$lt is clear that $T_d>T_s$

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