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In a vibration magnetometer, the time period of a bar magnet oscillating in horizontal component of earth's magnetic field is 2 sec. When a magnet is brought near and parallel to it, the time period reduces to 1 sec. The ratio H/F of the horizontal component H and the field F due to magnet will be
  1. 3
  2. 13
  3. 3
  4. 13


Solution

The correct option is B 13
T1HT1T2=H2H121=H+FHF=3H
or HF=13

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