Using a bar magnet P, a vibration magnetometer has time period 2seconds. When a bar Q (identical to P in mass and size) is placed on top of P, the time period is unchanged. Which of the following statements is true [MP PMT 1995]

Q is of unmagnetized ferromagnetic material

Q is a bar magnet identical to P, and its north pole placed on top of P's north pole

Nothing can be said about Q's properties

Using a bar magnet P, a vibration magnetometer has time period 2seco

1.	Using a bar magnet P, a vibration magnetometer has time period 2seconds. When a bar Q (identical to P in mass and size) is placed on top of P, the time period is unchanged. Which of the following statements is true [MP PMT 1995]
A.	Q is of non-magnetic material
B.	Q is a bar magnet identical to P, and its north pole placed on top of P's north pole
C.	Q is of unmagnetized ferromagnetic material
D.	Nothing can be said about Q's properties
Answer» C. Q is of unmagnetized ferromagnetic material