For a vibration magnetometer, the time period of the suspended bar magnet can be reduced by:

1.  moving it towards the south pole
2.  moving it towards the north pole
3.  moving it towards the equator
4.  anyone of them

Two bar magnets having the same geometry with magnetic moments M and 2M are firstly placed in such a way that if their similar poles are on the same side then their time period of oscillation is T₁. Now if the polarity of one of the magnets is reversed then the time period of oscillation is T_2. The relation between T₁ & T₂ is:

1. ${\mathrm{T}}_1<{\mathrm{T}}_2$

2. ${\mathrm{T}}_1={\mathrm{T}}_2$

3. ${\mathrm{T}}_1>{\mathrm{T}}_2$

4. ${\mathrm{T}}_2=\infty$

A bar magnet is oscillating in the Earth's magnetic field with a period T. What happens to this period and motion if this mass is quadrupled: