1.

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    [MP PMT 1990; Pb PET 2000]

A.            \[3\]                                        
B.            \[1/3\]
C.            \[\sqrt{3}\]                           
D.            \[1/\sqrt{3}\]
Answer» C.            \[\sqrt{3}\]                           


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